Merging TH1 objects in a TCanvas


I have four histograms drawn on one TCanvas. Is there a way to merge all of these objects at once, or do I have to merge each histogram individually and redraw them on a new TCanvas?

Let me be more clear. I have 4 histograms on a TCanvas that I want to merge with 4 other histograms on another TCanvas. Each histogram on one TCanvas is distinct from the other (e.g. data, MC1, MC2, etc). I’m trying to merge the data histo on TCanvas1 with the other data histo on TCanvas2, the MC1 set on TCanvas1 with the MC1 set on TCanvas2, etc.

THStack (drawn with “NOSTACK”).