Are you wanting to put it on a USB key so you can install it on another PC?
No, I want to put it on the same laptop using a USB key because my daughter is going to clean/wipe everything off of my laptop including Microsoft Office 2010. So after my laptop is clean I could put Microsoft Office 2010 from my USB key back on to the same laptop without losing it. Or so I'm hoping.
If I understand you correctly you don't need a USB for this.
If you have a valid Product Key for Microsoft Office 2010 you can download the suite from Microsoft's web site or use the installation CD. After your daughter has cleaned your computer, you re-install Office 2010. Of course, you'll lose any and all customization you've made to the office suite.
NOTE: Prior to launching this operation you might want to back-up all your documents onto a USB of sufficient size. Go to Settings>Update & Security>Backup.