Thank you for your comments in the off-topic section. I hope that the forum proves to be a constructive success for customers, distributors and ourselves at Pico.
I think what you are looking for here is the File | Merge function. You can use File | Open to open the first trace, then File | Merge for subsequent traces. (Edit | Duplicate copies the current trace with all of its settings intact).
If you then go to View | New Composite, you can create overlay and side by side views. Use Settings | Views... and Settings | Options... to configure this.
Pico Software Engineer