QOS from Central side to Remote end

I am wanting to apply QOS onto some of our WAN circuits. Here is my scenario. Headquarters end has a 45Mb DS3 to the MPLS cloud. Remote end has a multilink T1 (3Mb) connection to the MPLS cloud. We are doing BGP to the cloud itself. My problem is, the remote links request data from the Headquarters end (which works fine going from remote to HQ). However, when the download/file transfer starts, it completely saturates the 3Mb connection and nobody else can do anything on that circuit. I have applied some policing on the HQ end, but I also have a few hundred remote sites connecting to this cloud with the same AS number which causes some issues. Does anyone know of a way to QOS or prioritize mission critical traffic in this manner?
Please any help with this matter would be appreciated.
Thanks,

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Normally, there are two things that normally can be done; BTW they are not mutually exclusive.
If your device supports CBWFQ, you could define a class per branch and shape for the branch's egress bandwidth. However, if you have several hundred branches, you may run out of policy classes.
The other approach is to use vendor QoS. Many MPLS vendors will offer some kind of QoS support although sometimes it's an extra cost option.

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