Hi maddmike1959!
Thanks for contacting us with your question!
In theory yes, you can capture all events responsible for setting proper extremes after using some external buttons. You can see one of our official demos here:
https://jsfiddle.net/gh/get/library/pur ... textremes/ Extremes are set from the custom button. You can find all possible methods, which can be used in Highcharts here:
https://api.highcharts.com/class-reference/Highcharts
Unfortunately, this solution would be a really custom thing, so won't be fully supported by our support due to the usage of custom libraries. We would only support you in the usage of methods, which are part of Highcharts.
Kind regards!