[2005] SqlBulkCopy ?

[Motorui]

Hi guys! all ok?
what i need to know is how to do a SqlBulkCopy if the 2 tables arent identical!
or if there is a easy/best way to do it!
ill try to explain with an example:

table 1 : Id(int)-Pk ; REF(nchar(10)) ; Description(Nvarchar(max))

Table 2 : Id(int)-pk ; ClientId(int) ; Description(Nvarchar(max))

i want to do a SqlBulkCopy from table 1 only for the descripion field
and ClientId is the current client (from a Label)
How can i do This?
anny ideas?