hi
i have created channel section using section wizard where i have import the profile from Dxf file.
The same section i have also created using user table by defining profile polygon.
analysis is done for the both but in rendering only one is showing
my doubt is that which is the best practice to use our own section in staad pro.
You can do both approach. For regular type of sections like channel, I, pipe etc user table is very useful. For irregular sections or non-symmetric sections like I with plate, Channel with plate, star sections etc section wizard is very useful. For sections made by section wizard need profile points to show their render shapes. You may get more details in below link.
https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/73779/section-wizard-cross-section-created-in-section-wizard-is-not-cross-section-displayed-in-staadpro