I’m with @DonovanMcNeil. The Webelos program (4th & 5th grade) is the time for scouts and adults (parents and leaders) to being the mental transition to “troop life”. I was a scout as a youth, so I relied a lot on the way that my SPL and SM managed our troop in modeling how our “mini-troop” would be managed. Although we were still “Den 10”, the scouts were “Phoenix Patrol of Den 10” and “Pokemon Go Patrol of Den 10”. Can you tell I had them name themselves?
As much as I could, I delegated things to the patrol leaders, either directly or through their den chief. That included routine stuff like taking attendance and getting latecomers up to speed, as well as helping plan “special” activities along the lines of “We’re going to be doing at least one hike with the troop. Where does your patrol want to do a hike? Get opinions from your scouts and vote on a top two. Here are a bunch of my hiking guides for the local area. I have post-its with info for some of the ones I’ve taken, but don’t feel limited by those. Try to keep it under 10 miles for some of us old guys, yeah? Talk to your den chief to see if he has any recommendations or comments on the locations you’re considering.”
I walked them (and our den chief) through the logistics of the bigger tasks. Each of the PLs and APLs got a Patrol Leader Handbook, which I asked them to read and use. It was still pretty clear that we were a den, in that we sat together and I managed things like adventure/rank/awards approval and presentation, but I called them up “by patrol” to do awards as much as the schedule would allow.
All of these things were really helping to prepare both them to take over and me to let go when we transitioned from the pack to the troop. I’ll bet there are varying opinions among our scouts and unit scouters on how well that worked, and I frequently have to remind myself to lead with “Did you ask your patrol leader?” when I get questions. However, all told, I think it prepared the scouts and the adults well for the transition.