How Can I Add Descriptions To Porfolio Categories?

So here is the site I’m working on – https://astrographic.net/

I like how the main parent portfolio has a description field I can use to sum up my services as shown here – https://astrographic.net/project/ although right now I just have filler.

I want to know if I can add descriptions to each service portfolio for like here – https://astrographic.net/project-services/logo/

I know the Services creator allows me to add a description, I just need to know where to change the code so that it can pull the description for each service page.

I hope that makes sense.