>>-...TF is to be set to what value?

For skipping 4 bars, have you tried the value 4?

>>I want to trade during "market hours" and I want to use a series of bars/frames that will ONLY contain information from that period.<<

What are you then doing with timeframes? If you only want to completely ignore bars outside market hours, then simply do not use their prices for your indicators and do not trade at that time.

Maybe the problem is some misconception of bars and time frames. I do not know what you want to achieve, but when you explain in more detail when and under what conditions you want to enter which trades, I can probably help better.