[GNC] generating a report for a single transaction type repeated in one account

[Ed]

   Gnufriends,
   I'm trying to get a report from Gnucash that will display (and produce
   a sum of) all instances of a particular transaction in a single
   account. For example, I want to go to my checking account and see all
   instances of "payroll" - a repeated transaction that takes place
   more-or-less on the same day every month going back several years.
   I suspect that there's a relatively simple way to do this (?) but I
   don't know which Report Type to select ("Transaction"?) and how to
   create a filter that will select only those transactions that have
   "Payroll" in the description.
   Thanks for any help you can provide!
   Ed