How do i output CMY reg marks over BLK master reg mark without the BLK being knocked out on BLK film

Question

how do i output CMY reg marks only CMY films where they are over the BLK master reg mark without the BLK being knocked out on BLK film

Answer 1

You're evidently doing some kind of custom registration, but not explaining what it is.
First, what kind of printing are you doing that requires ten seps (CMYK and six spots)?
By definition, the Registration Swatch prints solid on all seps, both process and spot. But you talk of a CMY registration mark as if it is distinct and separate from K. Don't you also want your CMY seps to be registered not only to each other but also to the K?
You mention a "master" registration (as opposed to…?) needing to appear on the K sep. If a registration mark only appears on a single sep, what is it going to serve to register to; and how if there is no corresponding mark on the other sep(s)?
You seem to be under a not uncommon misconception that separations are somehow associated with Layers. They're not, unless you just want to organize your drawing that way for some reason.
If you want to create your own registration or fold or other printer marks which separate only to specific process inks, simply create and assign Swatches defined with 100% values of the desired component inks. There is no need to set these marks to overprint.
If you want to create your own marks which separate only to specific spot inks, those will need to involve object-level overprinting. You do not have to do that using multiple objects. You can assign multiple Strokes to a single path and set the overprint attribute on the Strokes individually.
It almost sounds like you are designing for screen printing on garments, and want to use registration marks. But because there is no "trim" region on the garment, you are trying to build the files in such a way that the marks end up being overprinted (therefore hidden) by subsequent inks. The default assumption in forums like this is always commercial offset printing. Otherwise, you should always state the printing method for which you are designing and describe the pertinent parameters.
Edit:
>"... this is a silk screen process with each colour applied over the other..."
We were typing at the same time. So it's as I suspected (or similar). Your description of what the printer wants is still confusing.
JET