SAP SD Pricing: Real Time Scenario

We need to create a custom table.
Field contents :
Routes, delivery priorities, transportation zones, and transportation planning point.
We have to create a table ZCustom with the above fields and add this field into the Field catalog.

Access Sequence would be
0001: Routes/deliverypriority
0002: tzone/Tpoint/route/delivery priority

Pricing Routine Requirements
A pricing routine is required to calculate the pricing condition value.
Routine -911: If a condition type Pr00 = 0 then move the condition value of PR01 into Pro0 . Both these condition types will use the above access sequence and both are Basic Prices.

Questions:
1 How would you proceed to add fields in the field catalog after creating the custom table
2 Where would you encapsulate the above routine i.e. in Alctype, Req or Cndbase value and against which condition type Proo or Pro1
Its a real time case scenario, please assist .