CADWorx Plant I tab: Setup Size/Spec > Setup 
> Specification / Size
CADWorx Plant I tab: Setup Size/Spec > Main Size 
Setting toolbar: Main Size
Setting toolbar: Specification 
Command line: SETSIZE, SETSPEC
Displays the Set Specification and Size dialog box in which you specify a drawing specification file, a main size, and a reduction size.
Browse
Enables you to open the project specification needed for your drawing.
Reload File
Reloads the project (.prj) selected for any changes made in the Specification Editor. Alternatively, type RELOADPROJECTFILE on the command line, and press ENTER.
M
Sets the selected row as the main size.
R
Sets the selected row as the reduction size.
OK
Accepts the selected main and reduction sizes, and closes the dialog box.
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CADWorx Plant specifications are delivered to the [Product Folder]\Plant\Spec folder. The projects and catalogs are broken down into folders by their units of measure. CADWorx P&ID also provides specifications delivered to the [Product Folder]\P&ID\Spec folder. If Plant and P&ID are used together, you should select specifications from a single folder. For more information, see SpecificationDirectory.
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The list of available sizes is controlled by [Product Folder]\Plant\System\SetSize.Tbl (English/inches), SetSizeA.tbl (Metric/inches), and SetSizeM.tbl (Metric/mm).