If you have got 'Manage Stock in Actinic EPOS' selected within the 'Configuration' screen (see Actinic EPOS Link Configuration) then the 'Estimated Stock In Hand' fields of your products (within the 'Stock' tab) will be shaded with a colour.
Now, whenever a stock level changes in Actinic EPOS, the new stock level will be updated within Actinic Ecommerce. Similarly, whenever an order is received within Actinic Ecommerce, and the stock levels of the ordered products go down, Actinic EPOS will be updated.
If you do not have 'Manage Stock in Actinic EPOS' selected within the 'Configuration' screen, then you have the option to select 'Actinic EPOS Link | Reset Actinic EPOS Stock Levels'. This will update Actinic EPOS with just the changes to the stock levels from Actinic.
To update Actinic with the latest prices from Actinic EPOS, you can select 'Actinic EPOS Link | Refresh Prices from Actinic EPOS'.
This will not be enabled if you have not selected 'Maintain Base Price in Actinic EPOS' within the 'Configuration' screen.
The first time you transfer products from Actinic Ecommerce to Actinic EPOS you will probably have 'All' selected within the 'General' tab of the 'Transfer Product Data' window.
From now on, you can select 'Changes Since Last Transfer' instead of 'All' and then whenever you click the 'Transfer' button, only the new products changes will be passed to Actinic EPOS.