How can I auto fill fields based on another fields data?

I am creating a database that will be used as a company contact list.  I am going to be using the following tables and fields:

Table: Contact
1.  ID
2.  Last Name
3.  First Name
4.  Phone Number
5.  Extension
6.  Email
7.  Branch

Table: Branch
1.  Branch
2.  Phone Number

I would like to use field7(Branch) as a lookup into Table: Branch and  would like field4(Phone Number) to auto fill with field2(Phone Number) from Table: Branch.

Thanks in advance for any help.
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Jorge PaulinoIT Pro/DeveloperCommented:
Add a combobox and follow the wizard. You can select the branch and insert the phone number in the appropriated field (contact table)
You can't do this at the table level. You can use the LookUp tab in the Table design screen to provide a list of values that are possible from the other table. But in order to default, wouldn't you need criteria to say that if branch = branch then  put this value in my field, else do something else?

You can of course use an on_load event on a form to populate a field based on that logic, but you didn't mention a form.

Theroetically in a normalised database you shouldn't need to.  I would suggest a slightly different structure as follows with a one-to-many relationship between the two tables on Branch_ID.

Table: Contact
1.  Contact_ID <Key Index No Duplicates>
2.  Branch_ID   <Index Allow Duplicates>
3.  Last_Name
4.  First_Name
5.  Phone_Number
6.  Extension
7.  Email

Table: Branch
1.  Branch_ID <Key Index No Duplicates>
2.  Branch
3.  Phone_Number


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