copying lines from one file to another using vi

Redhat wizards, I am doing good with auditing but want to copy key lines from example files into /etc/audit/audit.rules What is the vi/vim syntax to copy lines from one file and post them into another file - i.e. my audit.rules file? 5yy appears to yank the current line and 4 more and one can paste the buffered lines into the same file but I want to pass the lines to a different file. :h file_name I recall from along ago but that is for an entire file - I think: Please help me to copy files from sample auditing files into my real "audit.rules". Thanks, John