Can any one help me Open New Sales Order record on button click from parent Sales Order and pass values of multiple fields from Parent record and map all the field automatically except customer

This seems possible with a workflow. Use the go to record action and you can open in edit mode and populate your fields right in the go to record action

Thanks for your response sir ,Is their any possible way to do it on button click via. script

Yea you can do on button click using a WF (a script would work too but I’m not familiar with scripting) For a workflow you would have 2 states State 1 Add Button action Transition (Execute on button) State 2 Go to record (open in edit mode = T)