Decimal Flexfield in one attribute

Now the our flexfield is 16 characters thatswhy we are entering this field with points “.” like "8080.30.20.00.00"

But the users want to enter flexfield without points like 808030200000 and after that the flexfield has to automatically turn to 8080.30.20.00.00 this format,

Like a accounts segments you can think, but there is one difference we want to make this in one attribute, can anybody help us about this functionality

 

 

 

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