Selection.Paste (Word)

Inserts the contents of the Clipboard at the specified selection.

Using this method replaces the contents of the current selection. If you don't want to replace the contents of the selection, use the Collapse method before using this method. When you use this method with a Range object, the range expands to include the contents of the Clipboard. When you use this method with a Selection object, the selection does not expand to include the Clipboard contents; instead, the selection is positioned after the pasted Clipboard contents.

ActiveDocument.Paragraphs(1).Range.Copy 
Selection.Collapse Direction:=wdCollapseStart 
Selection.Paste