Note that if you delete an Ordinate Dimension origin, it will delete all of the dimensions which were created referencing that origin. But if you still want to do that, just select the the NAME of the ordinate dimension set and hit the 'Delete' key. If you've hidden the name, you'll have to 'Show' it first and then you can delete it.
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Digital Factory
Cypress, CA Siemens PLM: UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.
Make sure the name is turned on, and it will appear at the origin, and then delete it.
It's been a while since I worked with ordinate dimensions, so I forgot exactly where the place is to turn the origin on.