Why on earth is 12x18 not an available size in the elliptical pipes? I need this pipe size and do not know how to get it in the catalog.
open part builder...of course following all back up precautions prior to doing so.
Open Part Builder....
select part type (PIPES)
find the part family in question
click on Edit Part Dimensions
this opens part biuilder
once in the editor you will add part size dimensions by
Rt-Clcik on Size Parameters...Edit Sizes
Select any size data in the table
then either Edit the values for the pipe dimensions you need
or ADD the piepdimensions you need....
exit back out of part builder, saving changes as you go
the new part size will appear in the drop down NOTE it will not be in the correct sort order and never will be after this!