Character editing: Multiple Frames

I have a question. For some of my character wads, some different frames have the same sprites, for example some moving Sprites like CHARE1, CHARG1, CHARR1...

Is there a way, to merge this Frames in one sprite, to use only one sprite for alle this frames instead of more than 5 same sprite?

Unfortunately, this isn't possible in 2.1. However, it will definitely be possible in 2.2 under the new skin system.

However, if your character relies on a lot of repeated sprites, maybe you should think about what you're trying to achieve with it. Is it a lack of effort? Is it a sprite rip? Is it an intentional stylistic choice? These are important questions.