Manual exits of multi contract position (Auto update SL & TP when scaling in and out of positions)

Often times I enter with multiple contracts and I want the SL to be grouped but have the ability to take trims on my position as I see fit.

When I attempt this currently, it doesn't reduce the SL contract amount or the TP contract amount..for e.g. if I open 5 contract long, with a pre-set bracket order, I want to be able to take trims along the way without having to worry that my SL gets triggered and I'm suddenly short