Gst rate for two services by same job worker

Ajay Kumar (Account Supervisor) (129 Points)

25 November 2021  
I m doing the cloth printing jobwork.
I provides to services 1st prepare design on computer which attracts 18% gst under SAC 998391 2nd printing design on cloth which attracts 5% gst under SAC 998821. I charged from client on lumpsum basis. and I charged 18% gst on sale bill.
do I need to make two bills to avoid excess gst charged on my sale bill