For creating commission agent, you have to follow below steps.

1) Establish Partner Functions for the Commissionee(s)
Menu Path: TOOLS ->; BUSINESS ENGINEER ->; CUSTOMIZING ->; SALES AND DISTRIBUTION ->; BASIC FUNCTIONS ->; PARTNER DETERMINATION ->; DEFINE PARTNER FUNCTIONS
Transaction Code: VOPA

2) Assign the Partner Functions to Partner Procedures
Menu Path: TOOLS ->; BUSINESS ENGINEER ->; CUSTOMIZING ->; SALES AND DISTRIBUTION ->; BASIC FUNCTIONS ->; PARTNER DETERMINATION ->; DEFINE PARTNER FUNCTIONS
Transaction Code: VOPA

3) Create a Partner Procedure for the Commissionees
Menu Path: TOOLS ->; BUSINESS ENGINEER ->; CUSTOMIZING ->; SALES AND DISTRIBUTION ->; BASIC FUNCTIONS ->; PARTNER DETERMINATION ->; DEFINE PARTNER FUNCTIONS
Transaction Code: VOPA

4) Create New Customer Account Group(s) for Commission Agents
Menu Path: TOOLS ->; BUSINESS ENGINEER ->; CUSTOMIZING ->; LOGISTICS GENERAL ->; LOGISTICS BASIC DATA: BUSINESS PARTNERS ->; CUSTOMERS ->; CONTROL ->; DEFINE ACCOUNT GROUPS AND FIELD SELECTION FOR CUSTOMER
Transaction Code: OVT0

5) Assign the Partner Functions to the Customer Account Group(s)
Menu Path: TOOLS ->; BUSINESS ENGINEER ->; CUSTOMIZING ->; SALES AND DISTRIBUTION ->; BASIC FUNCTIONS ->; PARTNER DETERMINATION ->; DEFINE PARTNER FUNCTIONS ->; GOTO ->; PARTNER FUNCTIONS ->; ENVIRONMENT ->; ACCOUNT GROUP ASSIGNMENT
Transaction Code: VOPA

6) Assign the Partner Functions to the Partner Procedure for the Sales Document Header
Menu Path: Tools ->; Business Engineer ->; Customizing ->; Sales and Distribution ->; Basic Functions ->; Partner Determination ->; Define Partner Functions
Transaction Code: VOPA

7) Assign the Partner Functions to the Partner Procedure for the Sales Document Item (OPTIONAL)
Menu Path: TOOLS ->; BUSINESS ENGINEER ->; CUSTOMIZING ->; SALES AND DISTRIBUTION ->; BASIC FUNCTIONS ->; PARTNER DETERMINATION ->; DEFINE PARTNER FUNCTIONS
Transaction Code: VOPA

8) Edit the Pricing Communication Structure (KOMKAZ) to Hold the New Functions (Client Independent)
Menu Path: Menu Path: TOOLS ->; ABAP WORKBENCH ->; DEVELOPMENT ->; DICTIONARY
Transaction Code: SE11

9) Edit MV45AFZZ – userexit_pricing_prepare_tkomk (Client Independent)
Menu Path: TOOLS ->; ABAP WORKBENCH ->; DEVELOPMENT ->; ABAP EDITOR
Transaction Code: SE38

10) Edit RV60AFZZ - userexit_pricing_prepare_tkomk (Client Independent)
Menu Path: TOOLS ->; ABAP WORKBENCH ->; DEVELOPMENT ->; ABAP EDITOR
Transaction Code: SE38

11) Edit MV45AFZB - userexit_new_pricing_vbkd changing new_pricing (Client Independent)
Menu Path: TOOLS ->; ABAP WORKBENCH ->; DEVELOPMENT ->; ABAP EDITOR
Transaction Code: SE38

The following code should be inserted into program MV45AFZZ to allow the system to re-execute pricing if the user makes a change to the relevant partner function (alteration, addition, deletion).

13) Add the KOMKAZ Fields to the Pricing Field Catalog (Client Independent)
Menu Path: TOOLS ->; BUSINESS ENGINEER ->; CUSTOMIZING ->; SALES AND DISTRIBUTION ->; BASIC FUNCTIONS ->; PRICING ->; PRICING CONTROL ->; DEFINE ACCESS SEQUENCES ->; MAINTAIN ACCESS SEQUENCES
Transaction Code: OV24

14) Create Condition Tables (Client Independent)
Menu Path: TOOLS ->; BUSINESS ENGINEER ->; CUSTOMIZING ->; SALES AND DISTRIBUTION ->; BASIC FUNCTIONS ->; PRICING ->; PRICING CONTROL ->; DEFINE ACCESS SEQUENCES ->; MAINTAIN ACCESS SEQUENCES
Transaction Code: V/03

15) Create an access sequence containing the new tables (Client Independent)
Menu Path: TOOLS ->; BUSINESS ENGINEER ->; CUSTOMIZING ->; SALES AND DISTRIBUTION ->; BASIC FUNCTIONS ->; PRICING ->; PRICING CONTROL ->; DEFINE ACCESS SEQUENCES ->; MAINTAIN ACCESS SEQUENCES
Transaction Code: V/07

16) Create a new condition type
Menu Path: TOOLS ->; BUSINESS ENGINEER ->; CUSTOMIZING ->; SALES AND DISTRIBUTION ->; BASIC FUNCTIONS ->; PRICING ->; PRICING CONTROL ->; DEFINE CONDITION TYPES ->; MAINTAIN CONDITION TYPES
Transaction Code: V/06

17) Add the Condition Type to the Pricing Procedure
Menu Path: TOOLS ->; BUSINESS ENGINEER ->; CUSTOMIZING ->; SALES AND DISTRIBUTION ->; BASIC FUNCTIONS ->; PRICING ->; PRICING CONTROL ->; DEFINE AND ASSIGN PRICING PROCEDURES ->; MAINTAIN PRICING PROCEDURES
Transaction Code: V/08

11) Create Commsission Report ZZCOMMISSION (Client Independent)
Menu Path: TOOLS ->; ABAP WORKBENCH ->; DEVELOPMENT ->; ABAP EDITOR
Transaction Code: SE38

With Compliments by: Kamles

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