Previous (Self)....show a subset of this

Hi everyone,

I have used the Previous (Self) command to roll dimension values together into the one cell.

In some cases I have a large result output,  so I want to cut this down further to display just a couple of these dimension values. ie.

Tom, Dick, Harry, Billy, Sean, Matt, David - would become - Tom, Dick, Harry + 3 Others

Mary, Ann, Kate - would become - Mary, Ann, Kate

John - would become - John

Mary, David, Olwyn, Sean, Catherine, Billy, Kate, Deirdre - would become - Mary, David, Olywn + 5 others

I've tried Ranking but this doesn't work and I know I can't sort when I use the Previous function.

We are using: BI 4.1 SP6.

Suggestions would be welcome.

Thanks

Gill