Post Count for User from specific forums

[Maast]

here is what I need:

we have 4 forums which are "sale forums" so I would want "Total Posts in Sale Forums" which would be only the posts that were posted in the 4 sales forums based on user.

so If I I clicked on the user it could so the "Total Posts in Sale Forums" somewhere or I could put it below the total forum posts on the statistics section.

example:

User:
Posts: 2000 (<---- total posts in all forums)
Sales Posts: 1500 (<----total sales forums only posts)