How to setup material exclusion for customer during sales order creation?

If you want specific material to be added or excluded to a customer, you can do it in "Listing and Exclusion".

Here is a small note on listing and exclusion, it may be helpful.

Material listing and exclusion:

Material listing: Whatever the materials that are placed in the listing for a customer he can access to those materials only.

Maintaining records for material listing: 

Logistics
Sales and distribution
Master data
Products
Listing/Exclusion
VB01 Create
Specify the condition type for listing
Select the required key combination
Enter the required materials in listing and save it.

Material Exclusion: Whatever the materials that are placed in exclusion for a customer he cannot access those materials.

Maintaining records for material Exclusion:

Logistics
Sales and distribution
Master data
Products
Listing/Exclusion
VB01 Create
Specify the condition type for exclusion
Select the required key combination
Enter the required materials in exclusion and save it.

Maintaining condition technique for listing and exclusion:

SPRO
Sales and distribution
Basic functions
Listing/Exclusion
Maintain condition tables for listing/exclusion
Maintain access sequence for listing/exclusion
Maintain listing/exclusion types
Go to new entries and define condition types one each for listing, exclusion

Procedure for maintaining listing/exclusion
Define the procedure one each for listing and exclusion

Activate listing/exclusion by sales document type
Select the required sales document type and assign the procedure for listing and exclusion

Note: 
 1. Listing type  A001
 2. Exclusion type  B001
 3. Procedure for listing  A00001
 4. Procedure for exclusion B00001

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