Follow the steps below for mass extension of vendors: 

1. Login to MDO with your assigned credentials. 
2. From the left menu select Business Partner > Vendor. 
3. From the Vendor List page select all the vendors required to be extended.  
4. Once the records are selected, click on Download. 
5. Select Excel Connect and then select the Extend template. 
6. Click Download and open the downloaded Excel Connect template. 
7. Click on the Login icon at the top left corner and login with your MDO credentials.  
8. The selected records will appear in the Excel Connect. 
9. To extend the customer to other company codes and purchase organizations, click on the hyperlinks- Company Code and Purchase Organization against the vendor records. 
10. Then click on the Add Rows icon. Enter the number of rows required. The number of rows should be equal to the number of company codes/purchase organizations to which you want to extend. Enter the relevant details. 
11. Once the details are entered, click on the Validate icon. 
12. If the status on the left- hand side changes to Success, the data is validated successfully and can be exported to MDO. If the status is Error, there is a problem with the data entered. Correct the data according to the message shown and re-validate. 
13. Click on the Export icon to export the data to MDO. 
14. Once the data is exported, click on the Complete icon.  
15. The vendors are created in MDO and the extend workflow will be triggered.  
16. On completion of the workflow, the extended records are integrated with SAP.