This is what data slices in our panel are for.
A data slice is a collection of statistics which are gathered by applications or streams. You can assign multiple user logins for each data slice and your clients will be able to see their reports.
You may also give them the access via white label - this means the panel will be accessible via your own domain and with your own logo, so the clients will not see any signs of WMSPanel.
Please read those articles regarding data slices creation
and this article about white label:
This screencast will show these concepts in action:
Each data slice will have same set of reports as described in this digest article:
Please notice that additional slices require subscription upgrades according to our price list: https://wmspanel.com/prices_calc
To reduce the costs, please consider using lite slices: http://blog.wmspanel.com/2013/09/lite-slice-cost-reduction.html