code: function TbsMergeVarFields($PrmVal, $FldVal) {
  		$this->TBS->meth_Merge_AutoVar($PrmVal, true);
  		$PrmVal = str_replace($this->TBS->_ChrVal, $FldVal, $PrmVal);
  		return $PrmVal;
  	}
docs: Replace var fields in a Parameter of a block.
  @param  string $PrmVal The parameter value.
  @param  string $FldVal The value of the field that holds the value.
  @return string The merged value of the parameter.