Invoice Items, different rates

we are screen printers - items would be "screen printing" "embroidery" "garment" etc -
why are you forcing us to keep a set rate????

this means we have to type out the thing every single time because every job is custom making this product wholly unusable. just make the RATE part an option, because THAT is the piece we need to edit on the fly every time - but we still need to have selectable categories to keep from having to enter all info every time...