bp_core_new_subnav_item

bp_core_new_subnav_item(
	array(
        'name' => 'My Membership',
        'slug' => 'http://socalgolfer.org/membership-account/',
        'parent_url' => trailingslashit( bp_displayed_user_domain() . $bp->profile->slug ),
        'parent_slug' => $bp->profile->slug,
        'position' => 30
        )
);