This very important method uses casting and soldering investment is to set up multiple solderings at once. The idea is that you take clay (I prefer real clay, not plasticine - less oil and grease present to impede soldering) and make a 'bed' of it, a slab. Some people like to use a soft wax like 'BonBell' wax that covers small round cheeses instead of clay.

You take your jewelry components, pre-sanded and clean, and press them carefully into the clay (or wax) as you want them to appear when soldered together. That is, pushed tightly next to one another and to the half-way depth in the clay or wax. Then walls of some kind are built around the clay slab. Usually these are cardboard and duct tape or built using clay. Dentists would use 'boxing wax' for this job, this is the standard pink sheet wax that jewelers use to make jewelry models with, never suspecting its main purpose is to build 'boxes' for pouring investment into. Casting or soldering investment is then poured into the frame and allowed to set. When dry the frame and clay is carefully peeled off revealing the back halves of the components sticking out of the investment. When the investment has been allowed to dry out (which is very fast with Quickset #2 soldering investment and slower with casting investment) the protruding components are fluxed and soldered in one operation. Finally the whole thing is quenched in water to remove the investment. Any remnants are brushed away under running water. Malika Hemachandra, a Sri Lankan I met in Colombo did this with hundreds of components at one time, one giant soldering job for innumerable stamped and cast parts and settings in one go.. She was making large, very complex neckpieces with dozens of stonesettings and hundreds of parts, all done with one soldering operation. She used an iron bust to set up the clay and investment soldering jig.