When doing Restaurant Pickup and Delivery you cannot tip the restaurant by writing in the amount on the receipt. The amount on the Boss Card Receipt in the Boss App will not reflect the written tip as that is typically added in by the restaurant later.
If you'd like to tip the restaurant, you will need to either:
A. Tip in cash and add on the amount as an adjustment to be reimbursed.
B. Have the restaurant run a second transaction for the tip as the charge amount, then add the second transaction to the order before completing.