When you share your document with others and give them permission to edit, everyone's changes are made in the same document.
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In the top right corner, above the ribbon, click Share.

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Save your document in OneDrive, if it's not already there.
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Enter email addresses of the people you want to share with, and make choices for permission you want to allow.
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Type a message if you want, and click Send.
The people you're sharing with will get mail from you, with a link to your document.
