Multiple Report/Print Files

[Junior]

Hello.
I have a report which is grouped by supplier number.
I would like to be able to run this report, and then create an ouptut
for each supplier - PDF would be ideal.
I do not know how to do this.

Would someone please be kind enough to show me how to do this?

report name = Letter
underlying query = que_letter
grouped by = [VNUM]

Thanks is advance.
George