I want to use a card jointly on two boards. If I modify the map on one board that it is simultaneous

[Wouter Fonteyn]

I want to use a card jointly on two boards. If I modify the map on one board that it is simultaneously modified in the other board.

I use Trello for one-to-one meetings in my company. Each employee has a separate board but would like a shared card to use with another employee

[Brittany Joiner]

@Wouter Fonteyn there's a couple solutions for card mirroring. The simplest and easiest (albeit not cheap) option is to use Unito. You can specify the boards and what fields you want mirrored, and which direction you want things mirrored. 

If you don't want to pay for that, you can build some syncing functionality with Trello Automation tools, but this tends to work better with one way syncing instead of mirroring, as mirroring can cause a loop but I've seen some folks still be successful with it. 

To do this option, you would use Automation to set up triggers for the types of things you want to sync between cards, such as "when a comment is added" or "when a checklist is added" or "when a label is added", etc... and then in each of those, you'd add an action for finding the card with the same name on the other board, and then updated that card accordingly (add a comment with {triggercommenttext} , etc). 

You'll want to get familiar with Butler Variables, which will allow you to reference items from one card and inject them on another.