def add_tabs_to_yaml(yaml_string, tab_size):
    """
    Add tabs for each line in a block of strings
    :param yaml_string: String, text with yaml format. Ie, 
        "
        Create lead owners and create lead guarantors person if the client has the property active
        ---
        parameters:
         - name: client_id
           in: path
           description: Client identifier.
           required: true
           type: int
           default: 3
        "
    :param tab_size: Integer, Tab size. Ie, 1
    :return: String, text yaml with tab size added. Ie, 
        "
            Create lead owners and create lead guarantors person if the client has the property active
            ---
            parameters:
            - name: client_id
            in: path
            description: Client identifier.
            required: true
            type: int
            default: 3
        "
    """
    tab = '    ' * tab_size

    yaml_string = yaml_string.replace('***', tab)
    return yaml_string