QoS - Bandwidth limits based on network

Hello,

I need to create rate limits for 3 different subnets. (I'm running 8.308) The documentation doesn't make this scenario clear and it isn't mentioned in the KB...

I have a 40Mbps uplink, I want to limit download speeds to 5Mbps for one subnet, 10 Mbps for the 2nd and the last 20-25 Mbps for the third.

I think I need to do this:
Create 3 traffic selectors saying
Source - Internet
Service - Any
Destination - Network object for the subnet
TOS/DSCP - off

And create 3 Bandwidth Pools:
Bound to Uplink Interface
Bandwidth (5120, 10240 or 25600)
Specify Upper limit - checked
Upper limit (same as bandwidth)
Check box for appropriate subnet (traffic selector)

We will be putting in a secondary uplink in the future, I am guessing I have to go through binding the bandwidth pool to the new interface once it is in production...

Any help greatly appreciated.

Thanks!!!