A common problem in sample estimation is the one of producing estimates for parts of the original universe (these parts are variously referred to in the literature as domains, subuniverses or subpopulations and may be defined in terms of areas or other characteristics). A technique is presented for producing these part-estimates when ratio or regression estimates are involved. This technique is used to produce estimates of retail trade for areas such as States, geographic divisions, Federal Reserve Districts, etc. from the national sample used for the Monthly Retail Trade program. The technique used provides a quick computation of the estimate and its variance for any specified combination of counties. The estimates produced are always consistent with each other and with the national estimates.