> ## Documentation Index
> Fetch the complete documentation index at: https://storekit.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Menu Linking & Price Sync
> Match your storekit menu to the Comtrex till by POS ID, browse the till catalogue from the dashboard, and pull prices and tax rates from the till.
Comtrex does not import a menu into storekit. You build the menu in storekit — categories, products, modifiers, images and descriptions — and link each product and modifier to the till with its Comtrex item number in the **POS ID** field. Once items are linked you can pull the till's prices (and optionally tax rates) into your menu with **Price sync**.
There is no **Sync Menu** button for Comtrex. If you're used to Lightspeed or Toast importing categories and products, expect to build the menu yourself — see [CSV Import](/docs/guides/menu/csv-import) for the fastest way to do that.
## How Linking Works
Every item on the till has an item number (Zonal usually calls it the PLU). When storekit sends an order it lists each product and modifier by that number, so the till can ring it through as the right item. storekit reads the number from the **POS ID** field on your product or modifier.
| storekit | Comtrex |
| ------------------- | ---------------------------------------------------------------------- |
| Product **POS ID** | Item number of the sales item |
| Modifier **POS ID** | Item number of the ingredient / condiment item |
| Table **POS ID** | Table number — see [Dine-in](/docs/guides/integrations/pos/comtrex/dine-in) |
A product or modifier with an empty **POS ID** is silently left off the order sent to the till. The order still goes through and the guest is still charged for it, so an unlinked item shows up as a mismatch between storekit and the till rather than as a failed order. Link everything before you go live.
## Browse the Till Catalogue
You don't have to ask Zonal for a list of item numbers — the dashboard can read them from the till.
Go to **Stores** → your store → **Settings** → **Integrations** → **Comtrex**. The connection has to be saved first (see [Connecting Comtrex](/docs/guides/integrations/pos/comtrex/connect)).
Scroll to **Till catalogue** and click **Load catalogue**. storekit asks the till for its item sync and shows a summary — for example *2 lists · 5 items · 1 modifier groups* — followed by every list.
Expand a list to see each item's name, its POS ID and its till price. Modifier groups are listed the same way with a *Modifier* badge. Copy the POS ID you need into the matching storekit product or modifier.
Once loaded, **Load catalogue** becomes **Refresh**, and **Download raw JSON** saves the till's full response for you or Zonal to inspect.
The catalogue is whatever the till returns to storekit's item sync request. If an item you expect is missing, ask Zonal to check that it's included in the lists the RTO interface publishes.
## Link Products and Modifiers
Go to **Menus**, open your menu, and click a product to open the **Edit product** drawer.
On the **Details** tab, scroll to **POS ID** and enter the till's item number.
Click **Save changes**. Repeat for every product.
Open the product, switch to the **Modifiers** tab, and click the modifier option you want to link.
Enter the till's ingredient item number in **POS ID**.
Click **Save changes**.
Export your menu as a spreadsheet, fill the **Product POS ID** column, and import it back — see [CSV Import](/docs/guides/menu/csv-import). This is much faster than editing hundreds of products one by one.
## Price Sync
Once products are linked, **Price sync** pulls the till's current prices into your storekit menu so the two never drift. It runs against your store's active menu, updates only products whose **POS ID** matches an item in the till catalogue, and never creates, deletes or moves anything.
In **Stores** → your store → **Settings** → **Integrations** → **Comtrex**, scroll to **Price sync** and click **Preview price sync**. storekit contacts the till — this can take up to two minutes — and shows the **Price sync preview**.
The summary reads *N to update · N unchanged · N unmatched* with the number of increases and decreases beneath. Each row shows the storekit item, the matching POS item, and the current and new price.
* **Not found on the till** lists products whose POS ID isn't in the catalogue. Their prices won't change — fix the POS ID or ask Zonal about the item.
* **Conflicting till prices** appears when the till reports more than one price for the same POS ID; the first price found will be applied.
* Tick **Include tax rates** to also copy each item's tax rate from the till. The preview gains a **Tax** column so you can check it before applying.
Click **Apply changes**. The sync continues in the background and you'll see *Prices synced successfully* when it finishes. Click **Close** to leave without changing anything.
### What Price Sync Does and Doesn't Do
| | |
| ------------------------------------------------------------------- | :-: |
| Update the price of linked products | ✓ |
| Update the tax rate of linked products (with **Include tax rates**) | ✓ |
| Update modifier prices | ✗ |
| Create, archive or rename products | ✗ |
| Change categories, images, descriptions or allergens | ✗ |
| Run automatically on a schedule | ✗ |
Price sync is always started by you from the dashboard. If Zonal changes prices on the till, rerun **Preview price sync** — nothing in storekit updates until you do.
Price sync reads the same catalogue as **Till catalogue**. If a product's POS ID doesn't appear there, it will show under **Not found on the till** even if the number is right on the till itself.
## Next Steps
See how linked items are sent to the till
Fix missing items and unmatched POS IDs
## Related topics
- [Comtrex (Zonal)](/docs/guides/integrations/pos/comtrex/overview.md)
- [Connecting Comtrex](/docs/guides/integrations/pos/comtrex/connect.md)
- [POS Menu Sync](/docs/guides/menu/pos-menu-sync.md)
- [Syrve Menu Sync](/docs/guides/integrations/pos/syrve/menu-sync.md)
- [TISSL](/docs/guides/integrations/pos/tissl.md)