Is There a Way to Use a Text File for the Web Filter Function of CC Proxy Software?

Yes. Please open "Account Manager"-> Web Filter-> Click the button "..." on the right of the blank field which is for inputting filter sites-> select the text file you prepared for web filter.

Below is a sample format for that text file. Please note you need to make sure it is one item per line divided by semi-colon.

*.inhealthrecords.com;
inhealthrecords.com;
*.sleepcmi.com;
sleepcmi.com;
fedex.com;
*.fedex.com;
*.pahcom.com;