De or het portefeuilleverdeling?

The correct Dutch article is:

de portefeuilleverdeling

Rule Words ending in -ing: almost always de. See the rule

How to use portefeuilleverdeling

the portefeuilleverdelingde portefeuilleverdeling
this portefeuilleverdelingdeze portefeuilleverdeling
that portefeuilleverdelingdie portefeuilleverdeling
our portefeuilleverdelingonze portefeuilleverdeling
your portefeuilleverdelingjouw portefeuilleverdeling
every portefeuilleverdelingelke portefeuilleverdeling
which portefeuilleverdeling?welke portefeuilleverdeling?
a big portefeuilleverdeling / the big portefeuilleverdelingeen grote portefeuilleverdeling, de grote portefeuilleverdeling