"Paste In Place" is an update to a classic Kleanthis Economou command. It lets you quickly replace a bunch of existing elements with a different element, without having to carefully position each one. Simply copy the replacement to the clipboard, select the elements you want to replace, and run this command. The clipboard contents will be inserted at the same XY position, layer, and group level as the selected elements.

Note that the upper-left corner of the replacement is positioned at the same location as the original element. If the replacements are a different size, you might need to adjust their positions. All of the replacement elements will remain selected after running the command so that you can use the arrow keys to move them around.

The improvement over Kleanthis' original command is simply that any depth of grouping is supported, so you can replace deeply-nested sub-elements without having to ungroup anything.