This is a demo tutorial. While there is no step-by-step commentary available (yet), the live demo below is fully functional. Feel free to open it for full source code.
This demo shows how to create double-tooltips for series bullets. When hovered, bullet will display some content. When bullet is clicked it will display a permanent sticky tooltip with different information until clicked again.
See the Pen
Show different tooltip on click of a bullet by amCharts team (@amcharts)