Using Netsuite's schedule billing operation, my question is, are we able to bill a single line from a sales order? I've created a saved search and selected the main line to be false as I want to bill only one of the lines based on the item type whilst leaving the remaining till a later date... is this possible to do so? or can this process only bill the full order? What's the alternative?

Yes provided invoice in advance of fulfillment is not False under accounting preference> order management.

hmm that's set to true...