Setting Bit Size to Larger than 1/2"

Before I run a job I zero the bit using the Probe X, Y & Z routine. I have a 3/4" bowl bit. The largest bit size in the drop down is 1/2". How do I set the bit size the 3/4". I’m running the older software.

Just do the zero with a smaller bit setting the size of the bit you are using in the drop down. Once done switch bits and zero the Z axis to the bit you are going to use.