Hello Pip,
Thank you ever so much for the quick response ....sorry for the delay, but I haven't been on-line the last couple of days.
And, of course, also for the tips.....which, sort of half worked.
I first saved the houses/lots from games nr. 1, 2 & 3 to my library.
Then saved the households (Sims) from games nr. 1, 2 & 3 to my library.
This worked fine for games nr. 1 & 3...both lots and households appear in my library and I was able to transfer the house/lot (with household) from game nr. 3 into the proper space in game nr. 1 (which is my first and main game).
However, although I keep getting messages that both house/lot and household from game nr. 2 have been saved to my library (see enclosed), neither appears in the library (although they do appear in 'News')...so they can't be transferred into game nr. 1.
I now how the situation that I can:
Open game nr. 1 and switch between the houses and households from games nr. 1 & 3 and the Sims from these two games can all interact.
Or, open game nr. 2 and switch between the houses and households from games nr. 1 & 2 and the Sims from these two games can all interact.
Strangely enough, when I make changes (i.e., plants, trees, etc.) to the outside of the house from game nr. 2....these changes are visible in game nr. 1, but when the Sims from games Nr. 1 & 3 try to interact with the Sims from game nr. 2, I get the message that these Sims (game nr. 2) don't exist. The same when in game nr. 2: I can see the changes to the house from game nr. 3...but get the message that the Sims from game nr. 3 don't exist.
Rather peculiar......
Don't know if this will ring any bells with you.....anyway, still much better having two game instead of three.
If you have any further ideas, I'm happy to listen...if not, thank you very much for the assist you have already given me.
Best, Alex