Unfortunately, I believe this is not possible, at least not with Numbers v3.6.2. The Numbers dictionary shows that the Decimal property is not available for the cell or range classes
Taking a script and executing it:
tell application "Numbers" activate tell document 1 tell active sheet set the selectedTable to ¬ (the first table whose class of selection range is range) end tell tell selectedTable tell column "J" set the format of cell 3 to number get properties of cell 3 end tell end tell end tell end tell
Displays properties:
{vertical alignment:top, row:row "3" of table 1 of sheet 1 of document id "6F1021A0-BA54-47A2-A2DE-15B7E8DAFCED" of application "Numbers", class:cell, font name:"Helvetica", formatted value:"1.2345E+02", background color:missing value, formula:missing value, name:"J3", text wrap:true, text color:{0, 0, 0}, alignment:auto align, column:column "J" of table 1 of sheet 1 of document id "6F1021A0-BA54-47A2-A2DE-15B7E8DAFCED" of application "Numbers", format:scientific, font size:10.0, value:123.45}
.. none of which looks like a decimal place property: - (
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