You shouldn't have any problems when establishing a parameter of an inventory seat according to the price of the sub-table in the basic input application.
By any chance, are you using "lookup" in the app? If so, you can not copy the information from sub tables.
Could you be a bit more descriptive about what you are trying to do?
> using an inventory sheet (created in another app) that the standard input app
> sheet (check in/check out) but still use the sub tables inside the standards input app.