I'm very new to Blender, and I'm mainly learning how to model environments for historical recreations. I'm using BiomeReader to scatter vegetation in a project, and it requires a new vertex group to set the density of every different type of plant or scattered object with weight paint.
This means that I have a single mesh with several vertex groups. The problem is that I need all these vertex groups to have the exact same weight paint and I can't figure out how to do it other than manually painting every single group (and I will go insane if I have to do it like that), since all the other questions on a similar topic are about transfering vertex weight between different objects. I can provide screenshots if needed.