Is there a way to implement a trailing stop in a strategy that takes multiple positions to average in. Basically I want to set a 25% trailing stop from the Avg. Position Price each time an additional entree is made. If you can show code examples I would greatly appreciate it.

It doesn't make sense to have a trailing stop because avg price is based on the avg price the trade was entered at, not current price. Even if price goes up to infinity the avg price/cost will remain the same and, hence, your 25% stop will be static as well.