To copy or link an object, first select it by clicking on it. The manually plotted object will be highlighted (i.e. the dot markers will appear):
The embedded indicator line(s) will be displayed bold with dots on the edge(s):
A standalone indicator will be marked with dots on the corners of its frame:
You can deselect an object by selecting another object or clicking anywhere else in the chart.
To select several objects, hold the Ctrl button while clicking on them.
Pressing Ctrl+A will select all the objects in the currently active chart (including the manually plotted objects and the indicators). You can also choose the Select All Objects option from the right-click menu of the chart:
