Deleting Levels - shouldn't everything on the levels delete also?

[julielfifield]

I am just trying to understand how Revit functions.

In a project, if I delete all the levels, the  I would have thought everything would be deleted.

Everything except the Structural Framing (beams) deleted. The structural columns deleted. The beams were not pinned, so that is not it.

Why would the beams remain, if the level they were attached to was deleted & all other model object deleted?

[Anonymous]

Anything level based will delete with the level...Anything that remains is hosted differently or to a different level that you didn't delete.

[julielfifield]

Ok, the sounds like it makes sense, but I deleted ALL the levels.

The structural framing (girders & joists) were the only things left.

I thought because I used the Place on Grids command to place the steel, they were hosted by the Grids, except I also placed beams mid-span, which were placed by hand, not with the Place on Grids tool option.

Most hosted families that I am familiar with will tell you in the Properties what their Host is, but there is no host mentioned in the Properties for the beams.

To check my theory, I deleted the Grids from the elevation views, but the steel did not delete with the grids, so they must not be hosted by the Grids.

Is Structural Framing the only category that is not Level based? Or how is it Hosted?

[barthbradley]

Can you post this family that does not host to anything? 

[chrisplyler · Accepted solution]

There are things that can remain even if you delete their "host."

Some framing components need to be placed in elevation view on a work plane. While the plane still exists, they are "hosted" on it, as is evidenced by the fact that you can not move them in any direction that displaces them from that plane. But you can delete the plane, and they still exist, and are then free to move in any direction possible.

Any family that can be inserted using the Place on Work Plane tool behaves this way. So do Model in Place components.

[julielfifield]

Ok,, I get it. Thank you!