To renumber the model, or just parts of the model bring up the LIST menu (the icon is at the lower left corner of the window). From this menu select "Elements".
Once the element list is displayed, "block" (highlight) the section of pipe you want to renumber. (You do this by click and shift-click in the gray left index column.) Once the block is defined, right-click to obtain the context menu, then select block-operations. Answer the prompts from here.
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Regards,
Richard Ay - Consultant