I've added that set and some cards now.  

https://www.pricecharting.com/console/pokemon-chinese-s8a?uid=G89989

Other users can add missing cards too.

We are actually in discussions with them now about adding their sales to the site too.

Thanks for this idea.  For now, you can put those into a different folder "don't grade" or something.  Or you can add a note on the item that appears on your collection summary.  It wouldn't exclude them from grading recommendation filters, but you could quickly look at the note and see you wrote "bad condition" or "don't grade" or something on the notes.

Deleting as a duplicate request.

https://sportscardpro.userecho.com/communities/1/topics/1024-no-value-for-card-in-collection-use-the-cost-just-in-personal-collection

You can edit the folder names and delete folders here:

https://www.pricecharting.com/folders

Thank you

We will be adding this capability to the apps very soon.

Fixed now.

https://www.pricecharting.com/search-products?type=prices&q=Punisher%3A+War+Zone+11

Thank you

Added a new request for this.

https://pricecharting.userecho.com/communities/1/topics/2619-add-tag-10-price-to-apicsv

Thank you for the feedback.  We don't support that now.  The best way to achieve what you want now, is to edit the details on that item and change it to "Not working", which changes the value to $0.  Then you can enter a note saying "Reproduction".  As you browse through your collection you will see that note.

Do you know of a list of these sets?  I can see about adding them too.  I see this set.

https://yugioh.fandom.com/wiki/Deck_Modification_Pack:_Hyperspeed_Rush_Road!!

You can do that.  https://www.pricecharting.com/collection-text-importer

You just need to copy and paste some of the data from the spreadsheet instead of uploading the whole thing.