I ask the 'answer man' at the Haas web site, and this is what he/she replied.
"Regarding your G66 / G67 question to the Answer Man, Unfortunately the Haas control does not have the same G codes to perform that type of programming. One thing you can do is use the M97 subroutine call and nest another subroutine within it to get a similar type of program."
So, no. Haas VF machines do not have a modal Macro call.