InfoPath Dev

Hi, i have created form which show data from other list. Inventory Type = Hardware Inventory = Laptop= Qty =2 [User enter this] Add Button to add into details and allow further item to be added. Attached is screenshot. One issue is inventory column shown inventory based on inventory type selection but problem is that is only select firstone. secondly how do i add multiple item into form. pls guide.

You'll need to add a filter for your first issue - when you select the field in the field picker there is a button that says Filter data, you can use that to add a filter. If this is a list form and you want to use it to edit multiple items, that is a selection you can make when you first set up the form - if you start from InfoPath designer, select SharePoint List for the template type, you should see a checkbox to allow edit of multiples.