Ryan,
If you don't know what a Company Planning Procedure should consist of, that suggest you have never even seen one before?
If you have never even seen one before, I would suggest you may not be the right person to write one.
But if you are determined to have a go, a good Company Planning Procedure should include such content as:
-Policy on scheduling software, including mandatory / recommended settings, training, and software updates
-Policy on mandatory WBS, CBS, OBS, RBS & EPS
-Mandatory and free-for-use activity & Project codes
-Definition of Schedule Levels
-Scheduling practises (Rolling Wave Planning, Stagegates, BIM, etc)
-Minimum scheduling standards (level fo detail, max update periods, use of lags & negative lags, constraints, non-FS relationships, etc)
-Resource Loading (named resources? by trade? by gang? plant? materials? space?)
-Earned Value Methodologies (level of cost loading, EV Metrics to be reported, etc)
-Scope / Change Management
-Baselining policy
-Archiving policy
-Company / division / department-wide reporting
-Roles & Responsibilities
-Standardised report formats
-Regular review & revision of Conmpany Planning Policy
Good luck,
G