Add "Create New Group" Into Profile Groups Tab.

yzc_add_create_new_group_button.php

<?php

/**
 * Add "Create New Group" Into Groups Tab.
 */
function yzc_add_create_new_group_button() {
    if ( bp_is_active( 'groups') && bp_user_can_create_groups() && bp_is_user() ) {
        bp_core_new_subnav_item( array(
            'slug' => "create",
            'name' => __( 'Create New Group', 'youzer' ),
            'parent_slug' => 'groups',
            'parent_url' =>  bp_get_groups_directory_permalink(),
            'screen_function' => 'yz_get_profile_settings_page',
            )
        );
    }
}

add_filter( 'bp_setup_nav', 'yzc_add_create_new_group_button' );