Explanation
According to the AutoCAD for Design and Drafting documents1, the command that should be typed at the command line in order to start creating a line for drawing reference that starts at a defined point and extends to infinity in the designated direction is XLINE2. This command creates a construction line, which is a type of reference line that can help you manage accurate parameters of your drawing2. You can also use point objects as nodes or reference geometry for object snaps and relative offsets3.

* Issue with PDF Text Objects:
* When importing a PDF into AutoCAD, text objects may be converted to polylines.
* This happens because AutoCAD interprets the text as vector graphics rather than editable text.
* Conversion Process:
* Option A: The Combine Text tool (TXT2MTXT) is used to combine multiple text objects into a single multiline text object. It does not convert polylines back to text.
* Option C: The Edit Polyline (PEDIT) command and Join option are used to join polylines, not convert them to text.
* Option D: The JOIN command is similar to PEDIT and is used for joining polylines.
* Correct Tool:
* Option B: The Recognize SHX Text tool (PDFSHXTEXT) is specifically designed to recognize text that has been converted to polylines during PDF import. It converts these polylines back into text objects.
* Conclusion:
* Use the Recognize SHX Text tool to select all polyline text objects and convert them back to editable text.
References:
* AutoCAD Knowledge Base on PDF Import and Text Recognition.
* AutoCAD 2024 User Guide on PDF Import Tools.

The command that you should use is B. Collect Leader1. The collect leader option groups multiple leaders into one multileader object with a common landing line1. This option is useful when you want to create a single label or callout for multiple objects2.
To use this option, you need to select the MLEADER command and then select Collect Leader from the Options menu. Then you can select two or more existing multileaders that have similar properties and press Enter. The selected multileaders will be collected into one multileader object with a common landing line1.

* Set the Drawing Scale:
* Change the current drawing scale to 1:100 by selecting it from the scale list in the status bar or by using the SCALE command.
* Use the MOVE Command:
* With the drawing scale set to 1:100, select the annotative text label.
* Type MOVE in the command line and press Enter.
* Click on the text label and move it to the desired location outside the building.
* Verify the Positioning:
* Switch back to the 1:50 scale to ensure that the label at 1:50 scale remains in its original position inside the building.
* Verify that the 1:100 scale label is positioned outside the building.
This approach ensures that each annotative scale label is positioned correctly relative to the different scales.
References:
* AutoCAD Documentation on annotative text: Annotative Text
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Open the Block Editor: Select the north arrow block and enter the Block Editor by typing BEDIT in the command line and pressing Enter.
Replace Text with Field: Select the text object (1" = 20') and delete it. Then, use the MTEXT command to create a new text object.
Insert Field: In the Mtext Editor, right-click and choose Insert Field. In the Field dialog box, select Object as the Field Category, and choose Viewport as the Field Names.
Select the Viewport Scale: Choose the Standard Scale property and click OK. This will create a dynamic text that updates based on the viewport scale.
Save and Close: Save the block changes and exit the Block Editor.
References:
* AutoCAD Help Documentation on Using Fields in AutoCAD