Adding a 3rd categorization block

Hello

We have setup ITSM for our client and are currently using two categorization blocks.

I read in a blog that as per default 2 categorization blocks are available but more can be added via the SAP BSP WD workbench.

Could someone tell me how can we add a 3rd categorization block using the WD workbench?

Thanks and Best regards

Saritha.