How do I import layouts

is any way to display another layout in the layout you are playing?, for example, i have the inventory in a layout named inventory, and when i press a key, the inventory appears in a small window witout leaving the actual layout

thanks in advance

Put it on its own layer in the inventory layout. Make this layer a global layer. Now if you add this layer to other layouts the inventory will appear and you just make the layer visible/invisible.