How can I send an email from Form A that includes data from Form B?

How can I send an email from Form A that includes data from Form B?

I have a Zoho Creator application with multiple forms.  I need to trigger an an email to send when a checkbox is checked on Form A that will send to the email address listed on Form A, but I need the rest of the email to pull in fields that exist on Form B.
 
How can I do that?