Create New Table with Dax

SELECTCOLUMNS(
    GENERATE(
        TableA,
        var Val = TableA[Value]
        var Cat = TableA[Category]
        var Chrg = 
            LOOKUPVALUE(
                TableB[Charge],
                TableB[Category], Cat,
                BLANK()
            )
        var Nums = 
            SELECTCOLUMNS(
                GENERATESERIES(
                    Val + 1, 
                    Val + Chrg,
                    1
                ),
                "@Number", [Value]
            )
        return
            Nums
    ),
    "Category", TableA[Category],
    "Number", [@Number]
)