Ok here it goes i have setup three instances one at my home one on boat and one on vacation spot house im using a nabu casa for remote access i would like to have one interface for all three instances and automations to trigger nodes from one place now i have to maintain three times. Could this be possible at the moment or not?
Kudos to you. If I had a boat and a vacation house, in addition to my home, I don’t think I’d have time for Home Assistant. 
You may wish to consider using a custom component called Home-Assistant-Remote. It uses Websockets to connect and communicate between instances of Home Assistant. Configuration appears to be fairly straightforward but, full disclosure, I have not experimented with it.
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Electronics and iot is half time of the day my job. Well we are all different, with different life priorities.
Thank you very much for directions will look to it. I could of bought out of the box sollution but i would miss all this hass magic that is going on.
I use api to access and template sensor/switch to add the items to main instance.
MQTT statestream and Eventstream work well but I found it created clutter and got a little confusing (document well if using this) But…it does not need open port so if connecting outside LAN or in some scenario MQTT may be preferred
EDIT
Just remembered you can use nginx to block all access to HA and only allow access by API. In this case, API will work even when over WAN