This script can be used in Excel > Data > Connections > Manage Sets.
'FILTER( [Customer].[Customer].MEMBERS,(InStr( 1,
[Customer].[Customer].CURRENTMEMBER.NAME, "AbcCustomer" ) > 0) )'
'FILTER( [Customer].[Customer].MEMBERS,(InStr( 1,
[Customer].[Customer].CURRENTMEMBER.NAME, "AbcCustomer" ) > 0) )'