In fact, you would only want to put one in the assembly and then the bill of materials tells you that there are 20 for example??? If that's it; It seems to me that this is not possible. Unless you force it into the nomenclature.
Please note: this is suitable for parts that are specific to a particular assembly or that are always used in this quantity. The information is stored in the part file. It is of course possible to vary this property in a way that is specific to the configurations of the room.
For other cases, you will either have to copy the part file (to vary the quantity).
Or use virtual components (making them independent to have different quantities):
You might as well do a controlled repetition (it implies that the holes are made via the wizard for drilling and/or repetition) and you will be sure that the quantity indicated will be correct (don't forget that any value entered manually is potentially wrong).
In fact, today we put all the screws, washers and nuts using the repetitions or driven by the sketches. Indeed it is not very complicated and quite fast. But we work on large assemblies and these hundreds of screws, if not thousands, inevitably slow down our stations.
I found a trick that consists of putting the quantity on the component in the "Component reference" variable which is located in "Document Ownership". This variable can be brought back into the nomenclature and with a small multiplication formula the correct number of screws can be displayed. The disadvantage is that it will create as many lines and therefore as many marks for the same screw.
there is the classic technique of creating a "Screws" folder at the end of the shaft,
Similarly, if there are repetitions, when we manage the screws, we always think about creating repetitions dedicated only to the screws (other than the repetition of components).
and to create a config in the ASM without (or a MEP-with-Screws),
or we will put the screws folder, and the screws repeats in the deleted state ...
(off-topic poll: how do you prefer to write CHC or CHc? me CHC)
I am also more inclined to create a specific folder and deactivate (deleted state) in the desired configuration its parts and associated repetitions.
Off-topic answer ;-): I'm also more CHC!
Another off-topic note: you know why SolidWorks names "remove " deactivating a part instead of just "deactivating". It is never easy to explain this term to novices! Because for me deleted is more synonymous with "Delete/delete" from SolidWorks.
Solidworks has improved its handling of large assemblies, do your general settings use the complex assemblies and large designs modes? (limits recalculations...)
Otherwise effectively manage a full configuration with all the screws a conf light without.
@Antho : "delete" comes from the fact, in my opinion, of deleting from the display (in connection with the display states), deleting being a permanent deletion. So no real inconsistency.