FIM 2010 R2: Creating Security Groups in portal : OU

Hi,

We want to create security groups in the FIM Portal and then sync them to AD. Now the groups could belong to different OUs in AD so is there a way to assign the OU in the portal ?

Can I customise the "Create Security Group" pop-up to have an input field called "OU" which can then be appended to the account name of the group to come up with the DN ?

Or perhaps someone has tried some other ideas for this scenario ?

Thanks