The only limit is that any given user can only create 3 a week, or so the FAQ says - I have about half a dozen I've created over time and not had any problems.
I'm afraid I'm not sure about copying things across - I've never tried it. I would have thought you might be able to go into the advanced customisation screen, and copy and paste the changes, if you're happy with that - it looks pretty much identical to the LJ one, from what I remember.
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The only limit is that any given user can only create 3 a week, or so the FAQ says - I have about half a dozen I've created over time and not had any problems.
I'm afraid I'm not sure about copying things across - I've never tried it. I would have thought you might be able to go into the advanced customisation screen, and copy and paste the changes, if you're happy with that - it looks pretty much identical to the LJ one, from what I remember.