Need help setting up multi-insert form

I have a Microsoft Access ordervform that I’m trying to duplicate as closely as possible using Wappler. The form inserts data into two tables (expense table and a line items table that may have multiple rows associated with each row in the expense table). In my Access form, the line items were entered in a horizontal form that automatically adds a blank row when the last row is filled (see attached image). I would appreciate help in figuring out how to insert several rows at once and also have an option to add additional rows if needed. I’m guessing I need to use a “multi-insert” server action, but I do not have a clue on how to do that.

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