Sergey,

I think I've got it:

SELECT rfq.*, ;
		rfqdetail.rqd_desc, rqd_Linenum, rqd_needby, rqd_reqnum, rqd_qty,;
		quotes.quo_freight, quo_portother, quo_date, quo_daysvalid,;
		quotedetails.qud_delivery, qud_unitcost, ;
		Suppliers.sup_name, sup_pk;
	FROM rfq INNER JOIN rfqdetail ON rfq_pk = rqd_rfqfk;
	INNER JOIN rfqsuppliers ON rfq_pk = rqs_rfqfk;
	LEFT JOIN Suppliers ON rqs_suppfk = sup_pk;
	LEFT JOIN quotes ON rfq_pk = quo_rfqfk AND quo_suppfk = rqs_suppfk;	
	LEFT JOIN quotedetails ON rqd_pk = qud_rqdfk AND quo_pk = qud_quotefk;
	ORDER BY sup_Name, rqd_LineNum

Got to do some testing to make sure it's correct, but so far it looks good.

Thanks for your time.