Our stock classes are standardised across all of our farms, so you are not able to add in your own stock classes or change any names of existing stock classes. 

The reason for this is with all farms working on the same basis, it presents opportunities in future to opt into optional features such as real-time benchmarking.

A current workaround is to enable an unused stock class, and then map your appropriate account(s) to this.

For example, if you do not keep track of Cull Cows on your farm, but you do have a stock class of Feeder Calves, you could enable Cull Cows and map your sales/purchase accounts of Feeder Calves. 

Then in your reports and in the planning tab, it will display Account name as opposed to Stock class name (excluding your livestock trading statements).