My Parents Visa Sponsor question – Porting sponsor from my brother to myself

[psp1]

My brother sponsored my parents visa and they came and went back to India. Now my brother went back to India. Parents got remaining 5 years valid visa. I would like to invite my parent, is there any form or process needs to be applied to embassy for the travel? Currently I am holding H1 visa with valid I140 and my extension is in progress and hoping I will get approval within couple of month.
Thanks, in Advance for any help.
Saravana

[immihelp]

There is no such procedure.

Please send them an invitation letter and they can visit.