Because I don't have my references with me I'm going to take a wild guess and suggest two pieces of paper:
Originally Posted by Captain of Kopenick
First, a special order at regiment transferring the man from the one company to the other. Special orders were used to assign men to extra duty at regiment (e.g., clerk, nurse), so I think they would serve for this purpose. If the intent is to also transfer the man's ordnance and camp and garrison equipage, the order should probably so state.
Second, a descriptive list made out by the first company commander and sent to the second, giving personal data and the status of pay and allowances (especially clothing).
If the special order calls for transferring ordnance or camp and garrison equipage with the man, then the first company commander should prepare the necessary invoices and the second the necessary receipts. You'll find forms for these in the Regs under the sections for the Ordnance and QM departments.
But I could be wrong. Enjoy!
M. A. Schaffner
Midstream Regressive Complainer