Custom number format

[Geo Jul]

Dear all

I trying to custom format a number 046711/23/003500 length 16 digests
I used 000000"/"00"/"000000" but it won't excepted

please help on this issue

Thanks, in advice

 

[Jeffrey Mahoney]

Remove the last quote from the end

 

[Geo Jul]

Remove the last quote from the end

Many Thanks