What add-in can I write in C# for Microsoft Project (BKR help)?

Question

Macros

Good day, help with a small idea for the BKR.
I initially chose a not very successful topic, but there is nowhere to go.
The theme of RBB is the implementation of an existing cloud system in a small company. It turned out a lot of theoretical "water" with the implementation project in MSProject. The manager suggests adding at least some macros/add-ins to add code to the job.
Has anyone come across something similar? Throw in anything, even the most crazy ideas. Thank you for your attention. Of good.
PS. Sorry for such a strange question, my head is already moving.
BKR - bachelor's degree. job (aka diploma)

Answer 1

What kind of system is being implemented?
It's one thing to keep track of business tasks, it's another to draw letters with tasks on a calendar.