Transaction variant for CA02

Dear Gurus,

We will be maintaining two group counters under one group of routing. Now, two different users will be accessing CA02. The 2nd user shall be restricted to edit one group counter only. With this, I need to create Transaction variant for this user wherein the 1st counter can be edited while the second counter must be in display mode. Kindly give inputs how i do this.

Thanks.

Regards,

Ching