Captializing a word in a reference title one time only.

I want to include the term “Payroll” as a capitalized term in a reference, because in refers to the name of a department (Human Reources and Payroll best practices report).  I don’t want to add “Payroll” to the captialization preference list, as almost all other references need to be lower case, such as in “Improving payroll processes”.  How can I force capitalize the word one time?