How to handle if there are too many options for one filed?

I am building a business directory. Every business has their own page and users can submit business to the website.

Under any business page, pieces of information like contact details and branch locations will be displayed.

The problem is, some companies have even more than 100 branches in my country. It is not practical to ask to submit all branches. Even if asked it, it won't work.

So is there any way to solve this problem?

The only solution I think of was to tell the clients that displaying branches on this website isn't practical.