How to optimize just a part of modules in a string?

[Paulius]

Hello,

 

I was wondering, if there is a way to optimize not a full string of modules, but just a part of them? How that would look like in the system tab?

 

For example, I have a 22 module (460W) system and I want to split the modules into two strings, 11 modules for each. In one of them there would be 2/11 modules with optimizers, and in the other 5/11 modules with optimizers.