When you need to create a final producto from your items, you should follow these steps to have it assemble. On the device you will do it at
Main menu > products
Touch plus + sign
Type the final product info (name, code, Cost, Price, Category etc) > Save
Search for the final product created
Touch the double arrow icon > "Activate For Assembly", "Product for sale too" and "Touch items to assembly this product"
Search for the items that will create the final product type the amount necessary on each one > Finish
Main menu > Database
Database > Assembles
Assembly Orders > plus sign +
On the final product type the amount > Finish
Touch the final product
Touch the icon to receive the items into the inventory