1. A computer-implemented method for designing a biological model, the method comprising: displaying a user-interface having groups of elements identified as identical, each element having an associated biological model of a set of biological models, each biological model comprising a plurality of elements and interactions between elements, the plurality of elements being biological molecules; enabling a drag and drop user input within the user-interface that selects a particular element from a first group of the group of elements, drags the particular element from the first group of the group of elements to a second group of the group of elements, and releases the particular element near the second group; responsive to receiving the drag and drop user input, updating the first group to remove the particular element and the second group to include the particular element; and creating a combined model by combining the set of biological models according to the updated groups.