Don't know if I do it correct, but put all items in as seperate jobs the give them all the same invoice address, that way when you generate the estimate/invoice it will give you the option to add and remove items. You will need to go into system - then - invoice address - then add your adresss. Then when you go into jobs and add each one seperate tick the box that says - the invoice address is, - just pick the one you set up, do this with each individual job, that way they will link all together. Hope this makes sense.