Use the quantitative 4NT bid when you have a strong balanced hand and you’re not sure if your combined strength is enough for 6NT.
Typically you need 33 HCP to bid 6NT when you don’t have long suits to give you extra tricks. If you know you have 33 points between the two hands you can just bid 6NT, but if you are close to 33, you can use the quantitative 4NT. Partner will either pass with a minimum opener or bid 6NT with a good opener.
If you are wanting to ask for Aces after a NT bid you can use Gerber.
To ask for Aces when you are planning on playing in a suit contract use Blackwood
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