Does the ListView behave like a ListBox, allowing multiple items to be
selected?

Yes. An MS-Forms listbox is a cut-down Listview


Can items be put into the ImageList from within the worksheet?

I'm not so sure; I've always loaded up the ImageList with the graphics I
want at design time. However, it may be possible to load the binary data from
a COM control's .Image or .Picture property at runtime.

Let me guess: you want a set of 16x16 icons representing all the possible
line formats you will use in the chart...