Use the period converter indicator in any MT4 package. Place it on a 1 minute chart, Under the common tab place a check in the allow DLL imports. Then go to the inputs tab and next to period multiplier put the timeframe that you want, for 45 minutes change it to 45.
MINIMIZE the 1 minute chart, do not close it. Then got to file, open offline, and select the same currency that shows for example; EURUSDm,M45. You can then load whatever template you want. The drawback is you have to do this for every pair you want this for...
Search for it on Forex Factory or Forex-TSD, you should be able to find it easy enough. I use it for two minute charts with no issues....Hope this helps.
Tradeit