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Maria, try the following steps:
AutoCAD:
1. Explode Polyface Mesh into 3DFaces;
2. Convert all 3DFaces to Regions (REGION);
3. Save As "Slab Regions.dwg";
Revit:
4. Create a new...

Agree with Andres, try to recreate in Revit using the dwg slab link for tracing.

In what program was the slab modeled? Can you attach the dwg?

Hello!
MESHSMOOTH
CONVTOSOLID

But it’s better (to ask) to export as a solid or recreate in Revit, if not a complex shape.

Try to use MEP Fabrication hangers. They do not interact with design pipes and ducts, but they can be copied, resized without a host and they auto adjust to the floors. Use temporary fabrication...

If you export each floor /level separately, then why do you need to divide them by level when exporting? Just turn it off in the export settings.
1, 2 are not possible afaik.

This can be done using the lookup table, if it is possible to make a list of (acceptable) sizes / diameters.
Create an excel table with three columns:
<blank> | ID##length##millimeters |...

Сan you attach an example of what you need to get?

Yes, STL exporter will combine into one surface, so you can try to export without joining.

Well, maybe I missed something. Could you say on a specific occasion that it was absolutely terrible when using a family in which there is 3D geometry created by import and "explosion"?

Sorry, but I can't agree with a complete ban on the CAD Import. It is not terrible, if used properly. A neatly created 3D shape is imported correctly and does not cause problems. In some cases you...

If a parametric family is not required or there will be a small number of sizes (types), then I advise you to make this 3d solid form in AutoCAD or Inventor, and then Import CAD and Full Explode. The...

Updated several projects to Revit 2020.1, the position of the DWG (2013, WCS only) links has not changed. But, they were inserted with positioning "origin to origin" and not moved / aligned.

Unfortunately, this cannot be done, unless you make the rebar a loadable family.

What are these groups used for? Maybe they are not so necessary and can be ungrouped? Frequent changes? Then, you will still edit them, and as you change, you can disable the analytical model in each...

Afaik, Revit cannot do this. Use one elbow for all angles.

Hello

You need the type of Junction - Tap. Disconnect the branch and change its Pipe Type to another, in the Routing Preferences of which Preferred Junction Type is set to Tap. Reconnect.

Create a 3d view, name it;
VG > uncheck Show Categories on every tab except Analytical Model Categories;
Select All > Disable Analytical (context tab);
optional step:
Add this view to your...

Revit recognizes a rounded object if you start the dimension from some line and then to the circle.

Could you insert these pieces of piping into a new project and attach it here?
There is such a bug in Revit 2019...

You can place welds separately and include in custom connections.

Hi,

Check the shape family for the correct parameters.
This is a symmetrical shape, the short side can be A or C, which means that the value of B can be different.

This is a known Revit flaw, in the family enviropment constraints do not work with beams, based on special structural frame template (assuming you use them).
I'm afraid you have to create a new...

Hi

Try before alignment: right click the beam end dot > Dissalow Join;
then align

This bug was fixed in Revit 2020, but left in 2019.