Restricting the customer search based on customer grouping

Hi All,

I've two set of customers with two different groupings configured say (ZGRP1 & ZGRP2).

ZGRP1 - Customers created in CRM with the internal numbe range

ZGRP2 - Customers created in other systesm and flow to CRM with external number range.

when i'm creating a lead and inserting the customer via customer search it is showing both the grouping customers in the sreach result.

Can we restrict the customer with grouping (ZGRP2) in the search result of the customer?...is there any configuration change can we do for this?..

please suggest,

Thanks

Syam