In the Family Editor, there are a few ways to accomplish that, depending on the overall shape. The simplest method for cylindrical objects is to create a Revolve. Navigate to the Front View and invoke the Revolve command. Create the profile as desired (see image) including any fillets/chamfers. Then draw the Axis of Rotation Line and hit Finish.
If this does not suffice or answer your question, please elaborate and perhaps provide images that illustrate your intentions.
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Start a new Family based on the Mechanical Equipment Template*. Using the Project Browser, navigate to the Elevation View: Front. Go to the Create tab on the Ribbon and select "Revolve". Draw half of the the section profile of the tank centered on the vertical Reference Line (see image). Then select "Axis Line" from the ribbon and draw a line anywhere along the vertical Reference Plane. Click "Finish". Just let me know if you need more info!
*If for some reason, this template is not available, use the Generic Model Template and you can switch the Category later.
I would make this as an in-place family (Structure Tab>Component> Model In-Place)
Assign it to the walls category in the dialog that pops up.
Create a new extrusion. Sketch out the walls' inner and outer loops.
Set the extrusion height.
Set the material for the extruded walls.
Finish the in-place family.
You could also use regular walls for the rectangle, and make in-place or face-based loadable families for the chamfers, and use join geometry to get it to look like you want.
If you are quantifying all walls as a single pour, though, the in-place family may be the way to go, especially if you are not reusing the geometry.
Is that last image posted a top view? I thought it was a section! I think I may have misinterpreted the intent on this one...
If you want to use the analytical wall model to send to an analysis program, it might be best to use regular revit walls then cut out the part you don't want with in-place voids. Attached is a sample file where I did just that. Took all of 4 minutes.
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