How to mark for QoS coming into MPLS

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Recently changed direction of career from Enterprise to Service Provider. My first project is to implement QoS across our MPLS backbone. The theory is simple. We have 5 customers and 5 markings. Customer 1 will be EXP 1, Customer 2 will be EXP 2, etc. However, I cannot figure out how to initially mark traffic.

I can create class maps but those first look for a CoS, DSCP, or EXP marking. I want to mark based on either an ingress interface or VLAN and I cannot seem to figure that out. Can anyone provide any light to my path and point me in the direction?

[Virendra Pratap · Accepted solution]

you can directly use class-map default and set mpls experimental imposition bit according to your customer at customer ingress interface. 

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Thank you Virendra! On to phase 2 of the project now! :)

If there are others looking into this..

Looks like I needed to create several class maps and policy maps. On the ingress physical interface, I'm creating a service instance and then applying the policy map (service-policy command) to that service instance.