Exhibition eway bill clarification

Hello experts,

I'd like to create a eway bill for exhibition participation, and we've created a delivery challan. I require below clarification:

Bill from :Our company

Ship to: exhibition center,

1.should I choose regular or bill to ship to while generating an e-waybill transaction type?

2.Also, when I return from the exhibition to our organization, which transaction type should I choose?

Please advice Asap