How to enter several contacts into the same DEAL

How to enter several contacts into the same DEAL

We use to manage groups after the deal has become done, but there not exist a fluence way to enter all those persons or at least, I don’t know.

Have tried throught the "contact roles” but I need to make several steps just to enter 1 contact. I’m sure there would be a faster way to do it.

Please any help?