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1. Create the drafting object from sphere with followed options turned on.
   
2. With the New drafting object created, the reference point position will be defined automatically according to center of extents of the source entities. The Reference point is defined for the DRAFTING PART (with all of its drafting objects), not for each single drafting object within it:
     
3.  Add other 3D parts to the sphere to change the drafting object (The position is always related to reference point)
     
4. To define new reference point, right click on PART object in thedrafting tree and select Define Reference Point:
   
5. Ckick Click to define the new reference point position for the PART in Model Space:
   
6. All drafting objects within a part where reference point position was changed will be updated accordingly to new reference point position:
   

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