I have two bones, each with its vertex group and influence weights. I would like to join these two vertex groups and their weights so that they would only belong to one single bone. If - in edit mode - I assign vertices from one group to another, weights are not copied, unfortunately. Is there a way I could joint two vertex groups and keep their their weights?
I am not bone expert, but you could try this.
Select none.
Then select both vertex groups.
Then assign that selection to a new group.
Then use the name of the new group in place of the two previous vertex group names.
I’m not sure if that will keep your weight paints, but it might?