Hi SmallBusinessSupport,
Thanks for posting in Apple Support Communities.
You can import various file types for contacts to your Mac.
Import contacts from a vCard file (.vcf)
1. Do one of the following on your Mac:
* Double-click the vCard file—for example, in an email or on the desktop.
* Drag the vCard file to the Contacts icon in the Dock, or to the list of contacts in the Contacts window.
* In Contacts, choose File > Import, then select the vCard file.
5. Click Add in the message that appears.
Import contacts from an archive file (.abbu)
Important: Importing an archive file replaces your current contact information.
1. In the Contacts app on your Mac, choose File > Import.
2. Select the archive file, then click Open.
Import contacts from other file types
Before you import a tab-delimited or CSV file, use a text editor (such as TextEdit) to confirm the file is formatted correctly:
* Remove any line breaks within a contact’s information.
* Make sure all addresses have the same number of fields. Add empty fields as needed.
* Make sure fields are separated by a tab (in a tab-delimited file) or a comma (in a CSV file), instead of another character. Don’t include spaces before or after the tabs or commas.
Import the file by doing the following:
1. In the Contacts app on your Mac, choose File > Import, select the file, change the encoding if necessary, then click Open.
2. If you’re importing a text file, review the field labels.
* If the first card contains headers, make sure the headers are correctly labeled or marked “Do not import.” Any changes you make to this card are made to all cards in the file. To not import the headers card, select “Ignore first card.”
* To change a label, click the arrows next to the label and choose a new label. If you don’t want to import a field, choose “Do not import.”
Import contacts into Contacts on Mac - Apple Support
Regards.