There is a very useful AutoCAD tool that is usually turned off, which is the Right-click Customization. Under menu Tools > Options on the User Preferences tab, click the Right-click Customization button, then select the check box titled Turn on time-sensitive right-click. Click Apply & Close. This provides a great context-sensitive, pop-up menu. With nothing selected, the previous command repeats itself as before. But with a block selected, for example, a quick right-click brings up a pop-up menu with useful items such as Block Editor and Select Similar.
I typically just use the Layer and Name options on the Select Similar Settings dialog box. So after selecting a block, such as a Flag Note block with a single attribute, I right-click and choose Select Similar from the pop-up menu. All instances of the block matching the Layer and Name will be selected. Then I select the Find command and search for a particular attribute value, where I can either change just the Flag Note block with a particular attribute value to something else or use one of the Create Selection Set radio buttons (List results check box must be checked.) to create a selection set to use on an additional command, such as Move or Copy.
The Right-click Customization setting, when it is turned on, has endless time-saving options, such as the one described above.
Notes from Cadalyst tip reviewer R.K. McSwain: Joe has hit on a few different things here. Enabling the right-click menu can be very useful. Give this a try if you have not yet. The SelectSimilar command is one of the more useful additions to AutoCAD in recent years. As mentioned in tip #4406, just be sure to understand what options you have selected. Last, the use of the Find command to find text strings in a drawing is pretty common, but did you know it works on a previously selected set of objects? Good tips, Joe. Thanks.