EditPlus Regex - How to replace group 1 followed by 0

I'm trying to replace with Regex's EditPlus, values that contain comma-separated numbers and two decimal points, so they have 3 decimal points, adding a zero to the end. But my attempts eventually delete the value of the group instead of adding the zero to the end. The text is from a csv file, tab separated, over 12000 lines.

The Text to replace (just example):

Car 48,589  27,56   NULL    NULL
Bike    NULL    12,258  NULL    45,896
Bus NULL    11,23   NULL    85,25
Truck   23,45   NULL    45,458  NULL
Boat    45,89   74,12   NULL    NULL

Find Regex String:

(\t[0-9]{2},[0-9]{2})([^0-9]|$)

Replace Regex String attempts:

1. $10$2   // delete String Group 1
2. $1\0$2  // make a copy of group 1 until the end

The Expected result is:

Car 48,589  27,560  NULL    NULL
Bike    NULL    12,258  NULL    45,896
Bus NULL    11,230  NULL    85,250
Truck   23,450  NULL    45,458  NULL
Boat    45,890  74,120  NULL    NULL

The problem is that expression \10 does not mean \1 (the first fount instance) and 0. It means found instance number ten.

You can do the replacement in two steps: add some placeholder symbols that are not in you file, e.x. @@@@@

And in the second step replace the placeholder with 0

And the result is:

The \2 is needed to correctly work with the numbers at the end of line, like in line number 3.