Hi Jonah,

I suggest trying with "create a profile".

You can find more in Abaqus documentation (Abaqus analysis user's guide, v.6.14, section 29.3). You can also find some beam analysis tutorials on YouTube.

As you assign R, you need not to assign I, because in your case I=πR^4/4.

You may use "general section" (this is the case in other software, too). help may find in http://abaqus.software.polimi.it/v2016/books/usb/default.htm?startat=pt06ch29s06alm20.html