SQL Server 2008 :: Clone Hierarchy To Another Table

I have a table "t_prod_cat" which contains hierarchical data which is used in production to present data.

CREATE TABLE [dbo].[t_prod_cat](
[cat_node_id] [bigint] IDENTITY(1,1) NOT NULL,
[advertiser_id] [bigint] NOT NULL,
[cat_hid] [hierarchyid] NULL,
[level] AS ([cat_hid].[GetLevel]()) PERSISTED,
CONSTRAINT [PK_t_prod_cat] PRIMARY KEY CLUSTERED
(
[cat_node_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

In order not to impact the production website during the time an advertiser is editing (the editing might take much time and also mainly because at any time during the editing, the advertiser could cancel all the changes he did), I was thinking of transferring all the data linked to that advertiser to another table and let the advertiser apply any modifications up to the moment he will commit the changes.

Therefore, I would like to "CLONE" the hierarchy related to a certain advertiser_id to another table "t_prod_cat_work"

CREATE TABLE [dbo].[t_prod_cat_work](
[temp_cat_node_id] [bigint] NOT NULL,
[temp_cat_hid] [hierarchyid] NOT NULL,
[advertiser_id] [bigint] NOT NULL
) ON [PRIMARY]

What can be the easiest way to clone all the hierarchical data (multi-levels) from 't_prod_cat' to 't_prod_cat_work' for a certain advertiser_id ?