Hi,
I'm not sure if you can use query designer for transient providers..I think you can only use HANA studio for the new types of providers, I'm nor sure..
Try to read these:
What are Transient Providers? See if you have BW inside your ERP System
Creating TransientProviders on SAP HANA Models - Modeling - SAP Library
Transient and Virtual Provider for HANA model | SCN
Consuming SAP HANA Models in SAP BW - Transient Provider
Regards,
Loed