Configure a field that appears in 'Contacts' to appear in 'Accounts'

Hi All,

I have a field within 'Contacts' called 'Parentcustomerid' which essentially shows the Company name that the contact is associated with.  Its a searchable field that does not allow duplicate Company names and works great.

However,

When I go into 'Accounts' the 'Parentcustomerid' field is not available and instead there is a free type 'Company Name' field which is resulting in users creating duplicate company names each time they add a contact.

What do I need to do in order to make this 'Parencustomerid' field to also appear within 'Accounts' so that users can search for the parent company name and not end up creating duplicates?

Thank you!