I am using AX 2012 R2.
In Inventory status report i am able to select single item group at a time.
But i need to select multiple items groups.
https://docs.microsoft.com/en-us/dynamicsax-2012/appuser-itpro/chn-inventory-status-report. Do you mean this report?
This report is available for China and you already have a item group field in the query.
Click on select and for item group field select multiple values separated by comma.