...
Tip: You can use the TC Explorer Palette to drag blocks to and from drawings. See Drawing Settings.
...
Block Insertion Properties
These properties can be used if you want to change any aspect of the block instance - its location, scale, angle, or the block reference itself. For any block, open the Properties window and open the Block Insertion page.
...
Its Block Insertion page contains the current values for Position, Rotation, and Scale.
You can change the values in this window, or use the Select Edit tools and see the updated values in these fields.
To replace a selected block with another block, select the replacement block from the list and click Replace with. Click OK to implement the change.
Inserting Blocks into Another File or Application
You can also use the drag-and-drop technique to insert blocks into another open file.
...
Note: You can also use File / Extract To to export all blocks into another file.
...
Inserting Blocks from Another File
The Insert / File tool can be used to insert some or all blocks from another file into the current drawing (see Inserting a File). If both drawing have blocks with identical names, you can choose whether to ignore or replace them.
...
Ignore block(s): Click Ignore All and the blocks will not be added.
Options
Process all additional blocks: Adds and/or replaces all blocks found in the source file.
...
In the source file, select the blocks you want to export (select in the drawing area, not in the Blocks Palette). Copy the blocks (Ctrl+C or Edit / Copy), and paste them (Ctrl+V) into the destination file. The AddBlocks window will appear. This method imports both the blocks and the layers the blocks are on.