Hu! I see. :-) Sorry for adding to the confusion.
That's much easier, and in fact there are several ways to achieve it:
Option 1: Save your existing virtual orchestra as "Channel Set" (... select all Instruments/Icons you want to import into another VI Frame, right-click on one of the Channels in the Channels-panel at the left, and follow the menu dialog). Open the VI Frame which contains a MIR Pro Venue Preset. Right-click in the Channels-panel at the left and add the previously saved Channel Set.
Option 2: "Merge Project". Select the command "File > Merge Project ..." from VE Pro's main menu and choose a VI Frame which contains MIR Pro Venue Preset. Any instruments you'll see in a Venue Presets are meant to be seen as "note pad" only, so don't feel obliged to select them for the merger, but make sure to activate the option to merge in "MIR Pro Engine Settings" at the bottom of the Merge dialoge window.
Option 3 works the other way 'round: Save the VI Frame you are working on first. Open the VE Frame which contains chosen MIR Pro Venue Preset. Select the command "File > Merge Project ..." from VE Pro's main menu and choose the previously saved VI Frame which contains your virtual orchestra. Select the channels and instruments you want to merge in. Make sure to keep the option to merge in "MIR Pro Engine Settings" at the bottom of the Merge dialoge window deactivated.
HINT: You will have to re-align your virtual orchestra in any case, as all the Venues have different geometries and spatial properties, but you can do this easily by clever usage of MIR Pro's "Selection Groups".
BTW: Option 1 is good practice in any case to have pre-configured "building blocks" or ensembles at hand, without the need to rely on bloated, oversized "all-in-one" templates.
HTH,