I use more boards and I need to allow my employ to see and operate at least in two or three of them.
With Premium account I am able to allow him only one board
please let me know how to proceed and what is my cost
As far as I understand it, you'll need to buy your employee a Premium membership to be on more than one board in a workspace. https://help.trello.com/article/1236-board-guests
You could create another Workspace (that's non-premium) and add him to as many boards as you like in that workspace, but then of course you won't be able to use the Premium features on those boards.
Hope that helps explain it.
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