in the design page,I place some block or group instances,system will generated number automatically depending on the name_format,such as CON1, CON2..CON5.When I delete the CON3.CON4,5 whether can become CON3,4 automatically.
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Creo Schematics does not automatically rename instanced items, as such a function could generate unanticpated changes.
You would have to manually make the change utilizing the embedded paramaters dialog or selecting an instance > Right Click > Properties
As a side note, if you delete Con 3 & 4, and then select from the Admin ribbon, Design Properties > Reset Serial Numbers, then then next time you instance the connector Con 3 and Con 4 will be back filled