Hi Kyut,
Which version of STAAD are you using? If you're using STAAD.Pro v8i then surely it has a utility of CONNECTION DESIGN and it's really an excellent utility for 3D connection design. It has intuitive interface as well as tutorials in the help menu.
I think you need Bentley RAM Connection (or another 3rd party connection design application) - there is an interface between Staad.Pro and RAM Connection, but I don't believe Staad.Pro has any member connection design capability.
Hi Kyut and Jhardy1,
There is connection design option in STAAD called RAM Connection. I have just attached one image here for your reference only. I did a quick column to beam SP BCF type connection design. You can see from attached image that where connection design option is located.