Embodiments are directed to determining a data insertion point in a data layout based on relative cardinalities between data objects and to determining a data insertion point in a data layout based on defined hierarchies between data objects. In an embodiment, a computer system receives a user input indicating that an additional portion of information is to be added to an existing data layout which includes multiple different data objects. The computer system accesses the data objects to determine relative cardinalities between the data objects in the data layout. The computer system determines an optimal data insertion point for inserting the additional portion of information based on the determined relative cardinalities between the data objects. The computer system also inserts the additional portion of information in the existing data layout at the determined optimal data insertion point.