Configure FPGA reference- add a control

Hi,

I have an FPGA which contains many FP controls as well as other communication items.  I am using a dynamic reference to access the FPGA.  I have several smaller Type Def'd references which I use in SUbVI's.  Initially I created these using the 'Configure FPGA Reference' dialogue, I imported from the FPGA VI and removed the controls i did not want.  So far so good.  Now I find I need to add another control from the FPGA to one of my Type Def'd references.  I cannot do this from the same dialogue.  It seems that to get one more control I must import the entire FPGA again, and delete the unwanted items.   I am sure there must be a better way, can anybody suggest how I should be doing this?  I am using LV2012 SP1.

Thanks,

Michael