User can create a charge item which copy the prescription amont.
User should have the administrator right to edit the charge item. Following are the steps:
1. Go to Admin page, select Billing & Payment -> Charge
2. Update the item which you want to set it to copy the prescription amount
3. Check the "Copy Prescription Amount" field
4. Check the "Is Default" field if you want this charge item to be included in every consultation record.