Using two time frames is a common practice in the Technical Analysis. For example if you trade a trend following system you have to determine the general trend direction in one hand and in other you have to recognize  the exact entry / exit levels.
Normally a long period chart is used to catch the trend. Once the trend direction and strength have been confirmed, a shorter period is used to precise the deals.

Since Forex Strategy Builder uses one chart only to perform a backtest we use indicator scaling.
Let see the next example:
EURUSD 1Hour chart
   - Eneter long at the upper Bollinger band (Period 20, 2) when
EURUSD 1Day chart
   - Simple MA (5) rises.

Close at: 1Hour chart Parabolic SAR.

We do this using a MA(120) on the 1Hour chart. It is almost same as MA(5) on a 1Day chart. 5 * 24 = 120

We set in Forex Strategy Builder

Market: EURUSD 1 Hour

[Opening Point of the Position]
Bollinger Bands
     Enter long at the Upper Band
     Smoothing method  -  Simple
     Base price  -  Close
     MA period  -  20
     Multiplier  -  2
     Use previous bar value  -  Yes

[Opening Logic Condition]
Moving Average
     The Moving Average rises
     Smoothing method  -  Simple
     Base price  -  Close
     Period  -  120
     Shift  -  0
     Use previous bar value  -  Yes

[Closing Point of the Position]
Parabolic SAR
     Exit the market at PSAR
     Starting AF  -  0.02
     Increment  -  0.02
     Maximum AF  -  2