Update Child Contacts - Do not Contact Accounts to Contacts

Update Child Contacts - Do not Contact Accounts to Contacts

Hello!

In my zoho accounts I have a cell that indicates that the accounts - businesses are not to be contacted. It is a cell called "Do NOT Contact" which is marked with an X. 

In turn, I have contacts assigned to those accounts that also have a "Not Contact" field.

I would like that when I indicate in the account tab that the company is not to be contacted, it would indicate the same in all the contact files.

What would be the code I have to write in the function? I am already at the workflow automation section, but I have to write the code for this and I really don't know how. 

Thank you very much in advance!