When in a Forest with one domain and several child domains. There will be one Central Service manager to support all domains. It means all CI's and WI's will be imported in one database. But the problem for us lies where we want each domain to have its own console and helpdesk team. For example: Helpdesk users from each domain can only see objects, incidents, activities, reports and etc from their own domain and not by other child domains. Also The main domain (root domain) will aggregate and hold all information.
1. Install a Primary site in you second domain. "Optional"
2. Does the machine name of the SCCM server have READ rights on the second domain? Usually, if you do have 2 way trusts, there shouldn't be an access issue. If not, apply rights. and setup the two-way trust. (without this, it will never work)
3.You can still put a secondary site at the Domain B location(s) but keep it a member of Domain A. There is no requirment that says it has to be a member of Domain B to be physically co-located with domain B.
Install SCCM Client on Another Forest Trusted Domain
There are few ways to perform the SCCM client installation in another trusted domain. For example, using start-up or login script, manual installation, and using client push method. Out of so many method, I would like to share something on the client push method.
First of all, you are require to add the Server Locator Point (SLP) role in your SCCM server. Here is the: http://technet.microsoft.com/en-us/library/bb680672.aspx on how to create SLP in SCCM.
Next, add the account that has domain admin rights on the another domain to the Client Push Installation account. Here is the http://technet.microsoft.com/en-us/library/bb680908.aspx on how to configure Client Push Installation account.
After configured the Client Push Installation account, click on the Client tab. Enter the following to the installation properties, SMSSITECODE=XXX SMSSLP=SCCMSERVER.DOMAIN.COM
Now, try right click the workstation name and select Install Client, go through the wizard to perform the installation.