[Elecraft] How Can Memory access only VFO A?

[Jim McCook]

In CQWW CW it was common to find a pileup that was a big mess, or the DX 
at the bottom of it was hard to ID for some reason.  Time to move on and 
return later.  The frequency is left on the SUB receiver while tuning 
the MAIN.  Eventually I want to return to the bottom edge of the band 
without spinning the dial, so I need a memory to access only the MAIN 
VFO so as not to lose that other frequency.  This should be possible, 
but I can't figure out how to do it.  Can someone explain how this is 
done like with other radios?

I realize something short can be put into the bandmap for a later 
return, but if it's in a zoomed in mode the return is too cumbersome.  
Not a good option.

73, Jim
W6YA