SAP IDM Create user policies

Hi All,

We are implementing SAP IDM and we need to set IDM to create a user (identity) related to data bring from HR System, for example:

HR System ( there is a new employee called João Silva)

IDM needs read these fields from HR and create a user to login on target system like jsilva, with this policie, first letter of first name and last name.

And if in the future there will other João Silva, the IDM treat this case increasing number like: jsilva1, jsilva2.

This activity needs to be done automatically by IDM.

Do you guys have any suggestions to accomplish this.?

Thank you for your help.

Regards.

Miguel