Employee selects "acceptable" Vendors to "shop"
Note: the Employee would do the above for each of the seven "markets" of this trip (3 Cities/Hotels, and 4 Air Segments). After the Employee has selected "Vendors to Shop" for the first market (in whichever order "they" choose), while they are selecting "Vendors to Shop" for other markets, in the background, the Client software is querying the previous Vendors for pricing on the requested product.