I am using nhibernate as the target framework.

For a given field, is there a way to specify in the ui that the fields has to be updated only or inserted only?

Thanks

No, that setting isn't available. In general this isn't needed, as fields either are always updated/inserted or never: it's very uncommon to have a field be update only but not insert.

Could you elaborate on the situation you need this?

I've seen the flags in visual nhibernate and I was wondering about it.

I don't have a scenario off the top of my head.