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I have an EC2 instance set up called Machine1. I specified the security group to be Group1. How can I allow access in Group1 to any machine that comes from an internal EC2 request? Do I have the specify the IP address of each machine?

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Machines from the same security group can acces other machine in the same security group (by default). Usually this is the topmost rule in the INBOUND rules table like:

ALL sg-xxxxxxx (default) Delete

You can add like this other security groups to the rules, just check out the other groups sg-xxxxxx id on it's Details tab and then add it as the new rules source.

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