Insert a clickable Hyperlink

Is there any where I can put a clickable hyperlink ?
if Not maybe an idea in custom fields to make one in the pick list.
So we can link clients to their folders on C drive

you can use html code in your custom field. the below code works in Windows 10 OS.

<a href="C:\Folder1\Folder2\" target="_blank">Customer Folder</a>

replace the folder path and the words Customer Folder as per your choice.