[GNC] Combine user accounts

[nonno]

Dear Gnucash Representative,

I initially setup Gnucash, about a year ago, with my wife having a set 
of accounts and my having a set of accounts.  For example, when I go 
into Gnucash I open the file "personal.me.gnucash".  When my wife goes 
into Gnucash she opens the file "personal.wife.gnucash". I did not 
realize at the time that we have some accounts that we need to share.  
For example, we would like to have doctor expenses as an account where 
we can both add items.  Actually, it would have been better if we could 
open the same file and have all of our accounts shared.  Is there any 
way that I can combine the files "personal.me.gnucash" and 
"personal.wife.gnucash" into one file perhaps called 
"personal.us.gnucash" so that we can share all of our accounts?

Sincerely,
Robert