At IIM Lucknow, the courses provided are PGP, PGP-ABM, PGP-SM and nothing else except a few EPGP and FPM courses.
The BBA+ MBA course that you are talking about is the '5 year integrated program in management (IPM) ' course which is provided only by IIM Indore.
It is a Five year program and requires an entrance exam - IPMAT
It is a very good and highly competitive program.
Hope this helps!
All the best.