Hello, One Anaplan nice feature is the ability to create Subsets in List. I often use this feature for reporting purposes, or for designing allocations targets, or for filtering avalable product according to time, ... However, we still have the possibility to create two or more quite similar lists with one list having all the items (I call it tha master list) and the other list having only a selection of items (I call it the child). Then we can "link" the two lists together by creating a property, and by using function such as sum or lookup to transfert data from one module into the other module. Of course it creates a redundancy in lists, because the Child List is a subset of the Master List. From a functional point of view, the Anaplan subset feature is more direct, more efficient in a way (no sum nor lookup in the formulas). However, I sometimes use this solution of master List and Child list when it comes to create Data Entry module. I found that the Tick / Untick (or flg / unflag) feature of the subset is a little too dangerous for data entry module, at least if done manually. And if you untick (unflag) a list item subset you will loose all the data that have been entered manually. With the Child List solution, you of course can delete a List item by mistakes, but I feel it is nevertheless a bit more safe, it's less easy to delete a List item than to untick(unflag) a subset. Thus for data entry module, I rather use a duplicate list (child list) and have several lists than using the native Subset feature, which I mostly use for non-data entry modules. Pehaps a more robust solution from a psychological point of view, even if far less esthetical, and even if it requires additional list maintenance. Any comments welcome. Best regards. Michel.