can i flag a page that has incomplete info and come back to it at another time

Yes, you can.   Are you using Online TurboTax?  In Online TurboTax, while on the page you wish to flag, go to left column menu and click on Tax Tools > subtab Tools, then in the Tools window popup click on the blue button

Flags.  

That's also how you get back to your flagged pages.

thank you. 

You're welcome.  Good luck!