Can I be in more than one proposal/team?

Yes, an individual may be included in more than one proposal with different groups.

If both proposals/teams in which you are a participant are invited to attend, you would need to choose which of the teams you preferred to be a part of at the Institute, so you could give full attention to one of the teams/projects. We would then invite the other team to suggest a substitute for the open slot you created by withdrawing from that team.

So if you are on multiple proposals, be prepared to decide which one you will choose to participate with, should both proposals be invited to attend, and make sure the other team recognizes that they may need to find a substitute.