You can allocate a percentage of the assets to each beneficiary. For example, if there were two primary beneficiaries, you could allocate 50% of your assets to each, or 75% to one and 25% to the other, or some other combination thereof. The same applies for contingent beneficiaries. It’s important, though, that the totals add up to 100%, so that all assets are accounted for.
If the totals do not add up to 100%, your assets will be allocated evenly among the named beneficiaries.