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creo4 config.pro option documentation for: DRILL_MDL_DEPNDNCY_FLXBLE            

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auto_center_dimension

Controls the placement of dimension text between witness lines when dimensions are created in drawings.
no* - Allows you to place the dimension text anywhere between witness lines.
yes - Automatically centers the dimension text between witness lines.
 
* For common reference dimensions, this option only controls the centering of the first dimension.