Hello Veera,
Follow below steps:
1. Create a customizing request first.
2. Select created customizing request from the fiori launchpad designer settings icon.
3. create a new catalog and add the tiles from the core version or create a new one here itself.
4. create a group and choose the + icon within the group and select the catalog and pick all the fiori tiles you need from that catalog .
5. Make sure catalog and groups are looking good.
6. create a pfcg role and click on the context menu of the Transaction button.
7 choose SAP Fiori Catalog and choose your catalog
8.Similarly from the context menu, select SAP Fiori Group and choose your group created.
9. Now add this role to your 30 users.
That's it. All users will see newly added Group along with all the fiori tiles.
Hope this helps,
JC