In both TurboTax Online and the EasyStep view of the installed version, the amounts from the other T4A(P) boxes which are included in Box 20 are entered on the same page which you are reading "You do not need to enter the amount that appears in Box 20 of your T4A(P)".
Screenshots show both views.
dianajw1
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Testy_McTestface
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klama385
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myhouse2006
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