Click the Within arrow and select your company name.
Click the Find By arrow to select either Last Name or First Name.
Select either Begins with or Contains.
In the text box, enter in the part of the name you are searching by. Click . The matches appear in the Available Records box.
Select the user you want to add by highlighting the name. Click . The name appears in the Selected Records box.
When you have selected all the users you want to share files with, click OK. You return to the Sharing dialog box.