How to set User restriction access?

Good Day !
Kindly help me in setting user restrictions?
We have two companies on single server. i want to make a user who can only have full access at one company but don’t see other company data at all.

I followed User permission manager but it seems its still not working with me.

@Aamir, You can manage it by User Permissions and Role Permission manager, Refer Following links -



I m having the same problem. I have set up the restrictions as recommended in the tutorial. however, the user is still able to see all the multi company data.

I really don’t know what else to try. Hope you can help.