Sequence Number Generator is used to create a naming sequence of parts / assemblies.
Sequence Number Generator is enabled / disabled via the Kenesto Drive settings window.

When a new part is created, the Sequence Generator window will open:

Check Use Sequence Number Generator
You can use an existing sequence by selecting its name from the drop-down menu

Or create a new sequence by typing in a Name for the new Sequence, Sequence prefix and clicking on the button.

Next click on to create the next sequence number

