How to use Engineering Change Management with the Chip Planner (ECO)

Hi thanks, I will check out the assignment mode. I have not had to optimize my design like this before so I'm new to this. I usually just keep fiddling with fitter settings until it gets a setting combo that works.

I found another new thing to me, I can create a new lock lock region and then click properties. From the property dialog I can add individual design elements like registers or combinatorial logic elements so this looks like a close analog to what I did in ECO mode. Previously I just thought I limited to lock modules, but maybe I can use this feature. I will report back.