Production of subordinate flux ropes below the main rope and their involvement with the supply of material to the prominence. Top panels: distribution of J_z current density. Bottom panels: current and plasma density distribution in a vertical cut through the current sheet at x = 0. Left and right: construction of two additional flux ropes (t = 915.4, 1215.7 and t = 735.2, 1001.2 s) within the 3G and 10G cases, respectively.