I'm not clear on what you're asking. Are you wondering which activities you should reference in your personal statement?
On the AMCAS there is a section in which you list every single one of your activities along with a short description. You shouldn't leave any activities out here.
Your personal statement, on the other hand, is not a list of EC's but an essay meant to convey your reasons for pursuing medicine. You should reference specific experiences (e.g. "when shadowing a physician I met a child with cancer and hearing her hopes and dreams inspired me to pursue medicine") as opposed to general (e.g. "shadowing several physicians cultivated my interest in medicine"). You should avoid repeating material from your PS in your secondary essays, but you can certainly refer to another experience or lesson learned while participating in the same EC.