Group By Memo Field

I need to group by a memo field but it doesn't allow me, I tried making a formula in order to use it and I got a error Blob/Memo can't be used in formula...
I'm using CR 8.5
Please helptry using...

Insert -> Group

Choose the Memo Field... it will group by the memo field by then...

If this is not what you want you gotta give details...