suppose Sail chart is open.
If workspace is not open, go to view>workspace
in workspace, select Charts Tab
Open 'Basic Charts' menu
right click on
Price (foreign)
in dropdown menu select overlay
Properties(Parameters) Window will open
Give the name of symbol you want to overlay. (Tisco/TataSteel whatever it is in your database)
Select colour.
In style, tick
OwnScale.
Now you have two charts overlayed in single window.
This procedure can be repeated for multiple symbols also.
Omkar