How to Set backup key property in table Secondry Key

sanjeevdalela

I am database (maximum Tables Secondry keys Backup key =yes
so
How to Set backup key property in table Secondry Key new table.

Please help me

Example (I export customer tables in text format)
KEYS
{
{ ;No. }
{ ;Search Name ;BackupKey=Yes }
{ ;Customer Posting Group ;BackupKey=Yes }
{ ;Currency Code ;BackupKey=Yes }
{ ;Country Code ;BackupKey=Yes }
{ ;Gen. Bus. Posting Group ;BackupKey=Yes }
{ ;Name,Address,City ;BackupKey=Yes }
{ ;VAT Registration No. ;BackupKey=Yes }
{ ;State Code,Salesperson Code,City ;BackupKey=Yes }