Help with Sheet Summary formulas

I have a master list of projects from various departments, some projects are categorized as Stabilization projects or HRIS projects (for example). How can I create Sheet Summary formulas that do a count per department for specific fields. Example I would want one sheet summary field for Client Services projects that are flagged for stabilization (I am using a checkmark to identify those). Can you assist me in developing such a formula please. 

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