trading loss reilef for class 4 nics?

client is  a partner in 2 partnerships. One has made a current year profit and the other a current year loss.  I understand that you can offset the loss against the profit for class 4 purposes as well as tax purposes.  Can someone confirm this for me?

Also, I use tax assistant software.  I cannot figure out how/where to do this on the software. Anyone and ideas?

Thanks