How do I make it such that only one order can be made in one particular time frame?

i do not understand what you mean,

do you have 2 ea's in different timeframes or one ea with multiple idicators?

Use orderSelect loop. You need a different magic number per time frame or one magic number plus comment.

init(){ ...
    /*++++ Adjust for the current chart timeframe */{                   static
        int     tf[]        = { PERIOD_M1,  PERIOD_M5,  PERIOD_M15, PERIOD_M30,
                                PERIOD_H1,  PERIOD_H4,  PERIOD_D1,  PERIOD_W1,
                                PERIOD_MN1  };                          static
        string  TFtext[]    = { "M1",       "M5",       "M15",      "M30",
                                "H1",       "H4",       "D1",       "W1",
                                "MN1"       };
    for(int index=0; tf[index] < Period(); index++){}
    Period.text         = TFtext[index];
    magic.number        = Magic.Number.Base + index;
    magic.number.max    = Magic.Number.Base + ArraySize(tf)-1;
    /*---- Adjust for the current chart timeframe */}
...
}
    for(int pos = OrdersTotal() - 1; pos >= 0; pos--) if (
        OrderSelect(pos, SELECT_BY_POS)             // Only my orders w/
    &&  OrderMagicNumber()  == Magic.Number         // my magic number
    &&  OrderSymbol()       == Symbol() ){          // and period and symbol
        return; // Only allow one per time frame.
    }

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Huh? If the order is closed, there are zero orders in the time frame.