Drazen Sander

### What needs to happen? Update documentation contribution page: https://hop.apache.org/community/contribution-guides/documentation-contribution-guide/#doc-types 1. The video is blocked 2. In the section "Work on the documentation directly from the Hop website" add, where...

### What would you like to happen? I'd like to request the following step/transform that is present in PDI Mapping (sub-transformation)  Currently only those are present in Apache HOP...