Specific Users should add or delete data in Editable Grids

Hi,

I have an Editable grid in interface which displays the information, I also have an option to add or delete rows within the grid to add info or delete particular info.

For Example: I have a group named "XYZ" and users associated with group are "A", "B", "C". Now I need kind of privilege that only the users associated with group "XYZ" can add or delete data from that particular grid. Other groups should not have access to manipulate the data in the grids.

Can anyone let me know how can we achieve this.

Thanks