I have already checked the manuals and did not come up with my answers.

Is Shift+P 1 or 2 the only way to engage push backs?

How do you guys calc cg for the FMC input?

I have trouble getting the decent to start if I choose any method other than vs button then - xxx/1000 fpm.  I would like to dial up the new level and click the button to initiate but it doesn't seem to be receptive to the press, push or click.  Probably me.

Thanks,

RayM