I found a way to create email groups and send to them on the android gmail program.
1. Create a new "regular" contact and give it a name like "New Project Group" etc.
2. On an email line add the first email, ending with the right arrow (>). Then put the comma and a space and start the second email with a left arrow (<) and finish it with a right arrow (>). Do this until the last email and leave the last right arrow off. Then when you create an email from this "group" the email program supplies the first and last arrow and it works!
3. The line looks like this
email1@email.com>, <email2@email.com>, <email3@email.com>, <email4@email.com
4. Warning: You must begin from the gmail app and call up this group for it to format properly. If you start from within the contact list, and click the "email" icon, it doesn't work. (Of the two choice, I'm glad starting from the email app is the one that works!)
Note: If you are creating multiple groups to use, I found it easier to create the groups on my laptop in the regular gmail program, rather than on my tablet, but both work.