Add a previously exported DXF or DWG title block file.
If you created a title block using another CAD application, you can import it into Revit LT. Some text in the imported title block may reflect information that is specific to the project or sheet. Replace this text with Revit parameters so that the information can update automatically.
To import a title block
If the imported title block uses a non-standard size, select New Size.rft, and click Open.
If you cannot see the imported title block in the drawing area, type ZF (Zoom to Fit).
When you selected a title block size in the New dialog, Revit LT placed lines in the drawing area. These lines define the size of the printed page (the print area) for the sheet. If the imported title block is larger or smaller than the selected title block size, drag the lines to the edges of the title block.
If the imported title block includes text, perform a full explode to separate the imported object into its component objects. Then you can delete the text in the title block and replace it with Revit labels. (When you add a sheet to a project, these labels update to display project-specific or sheet-specific information.)
To explode the imported file:
The status bar displays the following:
Imports in Families : Import Symbol : location <Not Shared>.
You can now select individual lines or pieces of text to move or delete them.
For example, if the imported title block includes the text Client Name as a placeholder, select this text and delete it. Then replace it with the Project Name parameter that Revit LT provides, or another parameter that you have defined.
Re: Importing.dxf file in Allegro. Now you need to create conversion file click on tab to browse and type a name for your file click open. Then go to Edit/View layers here you have to map DXF layers to Allegro after mapping the layers click ok then import. If you follow the above steps then you will see how to edit CF in dialog box of DXF import.