Once you've created a column, I don't think it can be changed. You'll have to create a new one. I use the column type "comma separated text, like tags, shown in the tag browser" - this allows you to later add additional reading lists where a book may appear on more than one list. (It also gives you easy access to your lists via the tag browser, making it easier to incorporate into searches or what have you.)
In the Reading Lists plugin, select "Customize Plugin". Select your list from the "Lists" drop down. On the "Column Update Options" select "Update column for add or remove". (That option keeps the column in sync with the list.) Below that, select your custom column you created for your lists. Then, in the space under that, type in what you want to have placed in the column ("TBR1" for TBR list, "TBR2" for TBR2).
Once you've done that for your lists, leave the configuration and add a book to one of your lists to test it. For the ones already on your lists, you'll have to update that column manually. Just pull up the list via the plugin, select all the books, hit "e" and go to the second tab. Enter the tag you've selected for that list into your new Lists column. Do the same for the second list.
Now you're all up to date. Go into the Column Coloring setup and make your rules based on that column. Ex: Set color of column (title) to (aqua); If the (#lists) column (has) value (TBR1).
That should do it. Let me know if you run into something I forgot.
Edited to add: Once you've got it all working, you can right-click the column header and select the "hide column" option if you want to hide it.
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