[cprocess]

If you have calculated your milliamps per part, I assume you figured it by milliamps per square inch. Calculate your total square inches of all parts combined, then multiply by your milliamps per square inch. This will be the total miliamps you will need to process.
Depending on the type of current supply you are using, you may be able to set it at a certain voltage and allow the amps to adjust themselves. If you have calculted the milliamps for a certain part, see how many volts are required to get this milliamp reading. Then, when plating the batch of parts, adjust the current supply to that same voltage and the milliamps should adjust themselves.

Hope this helps.