If you have a Microsoft® Office 365® Business account, you can edit Microsoft Office files from the Documents tool. See Open or Edit a File in Microsoft Office 365 Using the Documents Tool.
The first time you open a Microsoft file to view and edit it in Office 365, you will be prompted to sign in with your Procore and Microsoft account credentials. After you are logged in with the necessary credentials, you will be able to open and edit files without leaving the Documents tool in Procore.