Inj Pre-workout with TRT

I've searched but gotten different answers. I'm currently on trt 120mg/week, test c, if I want to add in a blend or test base w/sdrol, do I subtract the test base from my weekly dosage?

For example just to make the math easier, I inject 20mg test c and 5mg sdrol, 3x/week as pre-workout, do I inject only 60mg/week of test c as my trt?

Would it make any different if I inject TPP as pre-workout since it's out of the system fast?

Anyone has any experience in this? Thanks in advance.