Dear @Gerasimos,

I need , omada, to forget 2 of the aps, but i dont want them to lost the configuration they have ( sid, password etc) as I work remote and cannot configure them. 

The aps now are Isolated as they are plugged to another network.

Is that possible? Can I delete them from omada and retain their configuration. I dont want to reset them.

Since the APs now are Isolated, they are not managed by your Omada Controller anymore, it won't reset them if you delete these Isolated APs from your Omada Controller by the option of Forget AP.

So you could delete the isolated APs from Omada Controller and the isolated APs will still retain the basic configuration, while some advanced features which need the controller to keep running (refer to this guide for more details) won't take effect anymore.

In addition, if you want to modify some settings for those APs in the future, a factory reset will be needed so that you can manage and configure them again.