If you're in a situation with a girl you like, or whom you and her both know there is mutual attraction, how should you go about letting her see you hanging out with other girls?

If we're in a club, and I'm holding hands, and dancing with other girls what effect is that likely to have on her?

who cares. you guys aren't in a relationship so there is no obligation to act a certain way. So what if she sees you and you see her..then you acknowledge her existence but you keep doing what you are doing. Some girls may get jealous, others may get competitive, and others may not care. Who knows. Find out.

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pua-lounge/the-importance-patience-this ... his%20game

A reality check:

Any attractive & social woman is going to have multiple interactions going on or multiple interactions available to her. And most girl swill play and interact with many or those interactions. Most every girl I pull is pulled from another guy (whether there at the club or a boyfriend or someone she's seeing somewhere else). Allow yourself to explore the interactions you desire to explore. Women do all the time. Just because I gave a woman multiple orgasms, an "unforgettable weekend" or date, etc. does not mean that she will no be pulled the next week by another guy.
So what I'm trying to say is that she's doing what you're questioning doing. The only thing that might not be happening is complete honesty. AKA she does it when you're not looking and you do it when she's not around.

Checking out a book "opening up" will clear some things for you and could improve your relationships with women as well.

Hope this helps:
Dommer