The Link button , located in the Work Area toolbar, allows you to perform grouped or single editing tasks on walls/construction lines and lines/shapes.
For example, when you move a wall or construction line group
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enable the Link button to move the entire group (when enabled, button background turns dark orange, see capture below).
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disable the Link button to move a single wall/construction line in the group (when disabled, the button background turns light orange; see capture below).
If the Item Snap button is enabled and you move or rotate lines or shapes (added through the ANNOTATIONS ribbon) near or on one or more other drawn lines/shapes
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enable the Link button to connect them and create a single object upon releasing the mouse button or clicking to confirm the position,
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disable the Link button if you do not want to connect them together upon releasing the mouse button or clicking to confirm the position.