I am at a loss on how to handle a strategy that has multiple lots with staged exit. Please point me to the proper documentation

What I want to do is - first step:
* Go long 3 contracts (futures) on a signal.
* Exit one at a specific target,
* Exit another at a specific target,
* Trail the third.
Naturally I need to be able to determine the amount of "lots" handled, but this can be a simple input parameter into the strategy. Every Lot will then consist of X contracts.
How am I supposed to do that?
* Set the contract number in the "go long/short" report.
* Then on every bar (not too complicated) enter multiple Exit parameters? Does that work like that?
I sort of miss the "proper" documentation for that, or an example. Any reference welcome.

Comment