I am looking to book the following but the price as one ticket is nearly double the price of two separate bookings. I want one booking for seamless through transfer of baggage.

Vienna to Delhi to Bangkok with a 5 day stop in Delhi is around £550 one way
Delhi to Hirasar (Rajkot) is around £200 return within this 5 day stopover

Booking as multi city Vienna to Delhi to Hirasar and then Hirasar to Delhi to Bangkok is over £1200 for the exact same flights as above. The Hirasar sectors are booking into a much higher booking class when done as multi city.

Can the call centre book the whole itinerary on one PNR and split the ticket if necessary to get the £550 + £200 rate, total £750, so that I can through check my bags from Vienna to Hirasar and then also from Hirasar to Bangkok?

Thanks