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set_tree

Set the current tree, if there are more than one sets of databases
Usage:
set_tree($tree);
$tree: It can be the default tree 'Top'.
       Or 'Top_1' if you use -Top_1 option to load in other design
       Or Top_ref in when using read_design("-ref", reference_netlist)
       If $tree is not defined, the current database name is returned
Note:
Implementation tree 'Top' has aliases of 'imp', 'IMP'
      Reference tree 'Top_ref' has aliases of 'ref', 'REF'
Examples:
set_tree("Top");
set_tree("IMP"); # Same as the above
set_tree("Top_ref"); # Set to reference tree
set_tree("ref"); # Same as the above, set to reference tree
set_tree();  # Return the current database name. E.G. 'Top_ref'