<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def clone_and_merge_sub(self, key):
 """Clones self and merges clone with sub-component specific information Parameters key : str Key specifying which sub-component Returns `ModelComponentInfo` object """

        new_comp = copy.deepcopy(self)
        #sub_com = self.components[key]
        new_comp.components = None
        new_comp.comp_key = key
        return new_comp