Sage Timeslips

I need to generate a new bill (that has dates on two different approved prior bills) within a certain date range. Is this possible without having to undo the two past bills that the date ranges fall into?

I created an invoice, but never sent it to LEDS format and I cleared the invoice from the billing stages. When I go to the "SLIPS" tab I can see the timeslips entered, but when I go to recreate the invoice the timeslips will not show up and only a "prior…