Brian, to copy a block to the current one:
Send in the signal you want to "reconfigure".
Adj
"Service"
"Copy Block"
Select the source block
And it'll overwrite the current block with the other one. To find out what block you want to copy from, send in the "source" signal, go to the same "Copy Block" screen, and you'll see a note (I think on the bottom) indicating the current block number. Remember this value, back out of the menus, and switch sources, then do the copy.
The memory block deal on a Barco (and most other projectors) is just a set of slots in memory where the projector stores all convergence information. When the projector fires up, it downloads the convergence data from the memory block(s) and uses that to properly control the electron beams to produce a nicely converged image. Geometry is also stored with the memory block.
Each different input frequency (both H and V sync rates) results in a little different behavior within the projector as it processes and displays that signal. Consequently, minor changes in H and V sync can result in the image being placed differently on the tube faces, requiring small corrections in geometry and convergence.
Thus, each frequency pair maps to a unique memory block, allowing the projector to store these corrections.