Hi kamalesh,
This MERGING has been discussed in detail with a boarder, Trendplayer.
Instead of finding the post ,I think i will post again.
1.Modify Study >>>>Studylisting.
Here click on the study to merge.
2.
3.Merge it with price.
4.From SubGraph ,your can choose the colour you want.
By choosing BOTH colours BLACK simply you can send the
study to BACKGROUND.