Sims 3 to sims 4 stove conversion

Hi. Sorry i hope this is the correct place to post my problem. I've converted a sims 3 stove in blender but i see it has 2 groups while sims 4 stove has 3 meshes. The stove the oven and inside the oven. I am getting stuck on the oven mesh. I asign the correct cut no but what about cut no 3 as there is no oven mesh on my sims 3 stove. Hope this makes sense.