What I do is pin everything with wooden dowell pins. Spoilboard to machine then blank to the spoilboard. I have to do stair stringers that are 18 to 22 feet long and I only have a 14 foot table. So I have to slide the work down to get it all. Sometimes I have to tab the part to the blank or use an onion skin of about 1/32 thickness then run through the wide belt sander to remove the part. If you have software and you can draw then it is easy to relocate parts to finish them. Every situation is different and the same method will not always work.