Microsoft Project for P6 User – Assign Activity Codes
Learn how to use Custom Fields to replicate Primavera P6 Activity Codes to enable grouping and/or filtering of tasks in Microsoft Project.
P6 Multilevel Activity Codes Tips
P6 allows us to nest activity code values into sub-levels but while there might be reasons to want to use activity codes nesting feature, I'm not a fan as nesting introduces WBS type rigidity to activity codes.