Hi, I've done it manually once or twice, years ago. It was pure hell. Your best bet is to contact another store asap and get with their comp shop TM and borrow their pda. You can log into like usual and do your shop. When you or the other person transmit the data it will submit both stores at the same time.
Another store close to mine, their shopper lives about a mile from me. We have each other's cell # and just communicate between us when our PDA is acting up or sent off for repair.
If you're really curious how to do it manually, you can go on Workbench and look around for the Comp Shop process. I printed ours a long time ago and made a binder for it. You have to know how to log into the computer and maneuver through this ancient AS400 program....the one with black background and green font. You use the F keys to get around. It really is pure hell. It will take you twice as long. Let's say you have the freezer section. You will enter the pizza items, save, return. Enter another section like ice cream. Repeat this a few 50 times. I hated it!!