There are three tools for modifying existing block geometry:
- Stretch
- Drag face
- Cutting tool
You don't explain the precise nature of the changes required in your question so I don't know whether the above tools can help, but you can find out more about these tools from the program help.
Also, you could just draw extra blocks side-by-side with existing blocks.
Otherwise if the above don't help, you would have to redraw the blocks.
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