Is sub-syndication a thing?

[Geoff Garber]

Say there is a syndicator raising $10M for an apartment complex.

Say I personally have $100k to invest, but there are other friends/family of mine that want to invest, they just don't have the relationship or time to build a relationship/trust with syndicators.

Am I allowed to "sub-syndicate" a group of my own network of investors to invest in the actual syndication?  So, instead of my $100k investment, I can pool together 9 other investors who put in $100k to make our total investment in the deal $1M?

Is this legal?  Is this common?  Do "sub-syndicators" take any fees for having the relationship/trust, presenting the deal, or any other admin tasks?