How to move the records from one table to another but number of column is different using sql server

Hi,
this below query is create the table. i want move the records for this table from another table.

declare @columns nvarchar(max)
set @columns='['+'ID'+'] Mem_ID,'+  '['+'RefID'+'] int,'
select @columns =  @columns+
                  '['+COALESCE( replace(cond,'_sys_defined',''),' ,')+'] datetime,'
                  from Condition
where idt=23
select @columns='create table idt_23('+SUBSTRING(@columns, 1, LEN(@columns) - 1)+')'
exec sp_executeSql @columns

i have another one  table is there. table name is test

select * from test id=23 . this reslt is moved to the idt_23 table.

but number of column is different source and destination table.
source is 300 columns, destination is my be 50 columns.

Regards,
Abdul Khadir.M