Win 7 & Win 10 On Same Start Drive Possible

Hi,
Not sure if title fully explains what i need but i will try & explain.

On my Windows pc i have Win 7 32 bit & also Win 10 64 bit
I switch on the pc & i see a start up option of which is Win 7 or Win 10, 7 is the default so if nothing is select then the drive with Win 7 is loaded.Most of my work is on the Win 7 drive.

There is one piece of software that i run which is 64 bit so at start up i select Win 10 so i can then use that piece of software.
But recently im finding myself using this software a lot more than before so my process is to restart pc then select Win 10 & do what i need to do.
This is getting pointless as i then need to do the same again should i wish to go back to my Win 7 drive.

Is there another way i can do this so i dont have to keep restarting etc.

Thanks

 

If the Win 7 was 64 bit, you could virtualize the Win 10 x64. But this way you'd have to go the other way around, virtualizing Win 7..