Hello,
I have built this PowerApp below which is using tabs to navigate between different form items based on their Visible values...

Due to the design nature, I have not inserted a SharePoint form into the app but am pointing the items value of the drop-down boxes to eg. Choices('Uniform order form'.MensPoloShirt) - where 'Uniform order form' is the name of the SharePoint list (uniformorderform).
I was wondering, how do I point the Quantity text boxes to the SharePoint list so that entered quantity values are added to the list item? An example column name would be 'MensPoloShirtQty'. Id like to get this sorted before I add any more controls for when the next tab is selected.
I've not built any apps where the fields are not within an 'Edit form' control.
For the record, the fields above are inside a container.
Thanks.