Multicam and Reconform

Hi Dudes
Currently I have a knot in my head:
I edited a Multicam Part of a Video and then ad Parts of that into the original Timeline with the whole video_
Timeline...Multicam...Timeline.
Before I started with everything I pulled my Footage down to Proxy Size and now for Grading I want to go back to my original 4k with "reconform from Bins". Whatever I tried, I could not connect my 4k to the Multicam. Then I opened my Multicam as a Timeline, where I see my files on top of each other. There I can reconform my Clips but closing the Timeline and open the Multicam again and touching the part in the timeline will show the Proxy resolution again. Any Idea??
Currently I have a knot in my head:
I edited a Multicam Part of a Video and then ad Parts of that into the original Timeline with the whole video_
Timeline...Multicam...Timeline.
Before I started with everything I pulled my Footage down to Proxy Size and now for Grading I want to go back to my original 4k with "reconform from Bins". Whatever I tried, I could not connect my 4k to the Multicam. Then I opened my Multicam as a Timeline, where I see my files on top of each other. There I can reconform my Clips but closing the Timeline and open the Multicam again and touching the part in the timeline will show the Proxy resolution again. Any Idea??