Select as many or remove as many as you want, make sure Vendor Product Name, Vendor Product Code, Unit of Measure and Quantity are selected\
Vendor Product Code is another spot to enter the Vendor Code for example an SKF number 26395 etc.\
Quantity is for if you get a discount pricing on bulk purchasing, so the price would reflect for a quantity of 50 $1.25 vs quantity of 1 at $5.00\
Vendor Product Name is if the product has a special name we can reference on the invoice that doesn't come close to matching our names given.\
Unit Measure is important because for some of our products we order a pack of something, it might come with 2 in a bag, but we sell them individually, so in this case the purchase unit of measure would need to be pair, selling unit of measure would be each.