Can anyone provide an explanation of the different areas
within Ramat Bet Shemesh Aleph?

What type of difference are you asking about? Do you have more specific questions?

RBS - Aleph is actually not all that big geographically. Population-wise it is more or less the same type of demographic - Young Anglo-Religious Olim. Some parts might be closer to stores and others to parks.

These websites might help provide more info:

http://www.cs.huji.ac.il/~momo/rbs/

http://www.israelhomeowner.com/CommunityHome.asp?id=2

Pinchus

Looking at the map it looks like there are distinct areas
I was wonder, whenI come to look at apts is one area more chasidish
one more yeshivish etc

by the way them info on those links has not been updated in many years

Thanks for helping

Ahh, Well Ramat Beit Shemesh Bet is the chasidish area. Aleph is Anglo - yes, yeshivish anglo, but working yeshivish anglo I guess you could call it. There are also some kollel families, modern orthodox and native Israeli dati leumi as well. So it is a mix though a solid majority are anglo.

I have heard the few non-religious families that are in RBS all live on nachal nachson (though we are talking about like only 5 families.) Other than that I'm not familiar enough to tell you if there may be pockets of one demographic here or there but my impression from visiting there from time to time is that there aren't any.

Though perhaps the best people to ask that question to is the people that are on the RBS mailing list that I think one of the link mentions. Maybe they could help you better. I could be wrong but I'm not aware of anybody on H.com begin from RBS.

There is one person but I don't think she's posted in a long time.

IIRC there are more and less chareidi parts of RBS A (because some of the conflicts were about a shopping centre in the 'charedi' part). But I don't know what that is.