Proportional representation is one of main families of voting methods for electing several candidates. It is further subdivided into party list based proportional representation and single transferable vote (STV). It is known that it is possible to simplify the calculations needed for implementation of single transferable vote by using one of the methods based on party lists - largest remainder method, if the preference lists are made of relatively long non-intersecting party lists (possibly listing one party list after another in the preference list, but keeping the order in each party list). This paper discusses a way to produce the simulated party lists that would make it possible to use the same algorithm without explicitly constructing preference lists from the party lists.