Yes, the folder \p is scanned by the software. Also the folder \parts.
If you use your part only in one other file, you also can put the subpart in the same folder than the calling file as that is the first place each application should search a linetype 1 reference.
Also be aware, that if you put any file in the standard library folders are not present on other systems. You need to ship those files together with your model if you like to share your model with your friends.
If you use your part only in one other file, you also can put the subpart in the same folder than the calling file as that is the first place each application should search a linetype 1 reference.
Also be aware, that if you put any file in the standard library folders are not present on other systems. You need to ship those files together with your model if you like to share your model with your friends.