bp_is_group_creation_step( string $step_slug )

function bp_is_group_creation_step( $step_slug ) {

	// Make sure we are in the groups component.
	if ( ! bp_is_groups_component() || ! bp_is_current_action( 'create' ) ) {
		return false;
	}

	$bp = buddypress();

	// If this the first step, we can just accept and return true.
	$keys = array_keys( $bp->groups->group_creation_steps );
	if ( !bp_action_variable( 1 ) && array_shift( $keys ) == $step_slug ) {
		return true;
	}

	// Before allowing a user to see a group creation step we must make sure
	// previous steps are completed.
	if ( !bp_is_first_group_creation_step() ) {
		if ( !bp_are_previous_group_creation_steps_complete( $step_slug ) ) {
			return false;
		}
	}

	// Check the current step against the step parameter.
	if ( bp_is_action_variable( $step_slug ) ) {
		return true;
	}

	return false;
}