Greg (NCRadioMan) is correct. Box splits of Cuban cigars are not allowed. (LOL
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Greg has also mentioned that other forums will become accessible over time. Be patient. It doesn't take much to gain access.
Once you gain access to the Box Split forum, you can organize a box split of any non-Cuban cigar you wish. Typically, a box split is organized pre-purchase and, if you so choose, money is collected pre-purchase as well. The other option is for you to purchase the box yourself and, when you gain access to the sales forums, you can sell off part of your box.
I hope this clarifies things for you.