Generate a Table with pre-defined values in column1, and a range of values in column2

Try:

n or more =
VAR _2OrMoreValues =
    GENERATESERIES ( 2, 10, 1 )
VAR _Prefix2 =
    SELECTCOLUMNS ( { "2 or more" }, "Param", [Value] )
VAR _2Table =
    CROSSJOIN ( _Prefix2, _2OrMoreValues )
VAR _4orMoreValues =
    GENERATESERIES ( 4, 10, 1 )
VAR _Prefix4 =
    SELECTCOLUMNS ( { "4 or more" }, "Param", [Value] )
VAR _4Table =
    CROSSJOIN ( _Prefix4, _4OrMoreValues )
VAR _6OrMoreValues =
    GENERATESERIES ( 6, 10, 1 )
VAR _Prefix6 =
    SELECTCOLUMNS ( { "6 or more" }, "Param", [Value] )
VAR _6Table =
    CROSSJOIN ( _Prefix6, _6OrMoreValues )
VAR _8OrMoreValues =
    GENERATESERIES ( 8, 10, 1 )
VAR _Prefix8 =
    SELECTCOLUMNS ( { "8 or more" }, "Param", [Value] )
VAR _8Table =
    CROSSJOIN ( _Prefix8, _8OrMoreValues )
RETURN
    UNION ( _2Table, _4Table, _6Table, _8Table )

However, for what you seem to need it for, I suggest a different table. Any relationship with the above table wil be many-to-many, which is to be avoided.

Instead, create a table with the threshold for each "n or more", keep it unrelated and then use a measure to return the filtered values:

On or Above threshold =
CALCULATE (
    [Sum value],
    FILTER (
        'Product Table',
        [Sum value] >= SELECTEDVALUE ( 'n or more (unrelated)'[Threshold] )
    )
)

Sample file attached