change table

[dark-o]

in our casino we have two tables nl 1/2$ with 200$ max buy-in.
players are shifting from one table to another with more chips or less then buy-in. So we have a situation when chip-leader from one table sit to another table. Is there any rule abouth shifting players from table to table? must they buy-in normal buy-in(in these situacion 200$ and less) or they can move from one table to another with all chips?