Don't know much about ATB, however from the online help center:
To Break the Associativity Between a TIM or ATB-enabled Feature and Reference Model
1. Select a Translated Image Model (TIM) or an Associative Topology Bus (ATB)-enabled feature.
You can only break the link of a TIM component with the main assembly. You cannot break the links of the subassembly TIM components with the main assembly.
2. Click Model > Operations > ATB > Make Independent or right-click and click Associative Topology Bus > Make Independent. A warning appears in the Creo Parametric message window stating that breaking the ATB link is permanent and cannot be established if it is broken.
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It is a permanent and irreversible action and you cannot re-establish the associative link.
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3. Click OK in the message window. The imported model or feature is
◦ Independent of its original reference model and is owned by Creo Parametric. It is a standard part, assembly, or feature.
◦ Converted to a standard Creo Parametric model or import feature.
There is always more to learn in Creo.
