Unfortunately this is one of the disadvantages of back testing on faster time frames – the history available is very limited. All you can really do is create a strategy based on the data available and then forward test it by running it live in demo. Not ideal and a very slow way of testing but it is the only way unfortunately. The good news is that if it is curve fitted to the data sample you used then on a fast time frame it shouldn’t be too long before forward testing confirms this especially if it opens a lot of trades. You may have to include emergency get out of the market conditions in case of black swan moments that your back test was never developed on but that it might have to trade through one day in the future.

Note: I changed your topic title to something a little more meaningful.

Yes you can use the following:

Defparam FlatBefore = 190000
Defparam FlatAfter = 210000

These will not allow trading before 190000 and close all trades at 210000 and not allow any trades after that time.

Alternatively you can just set a condition to allow or disallow trading:

Timeok = time >= 190000 and time < 210000

if Timeok and (your conditions) then
buy 1 contract at market
endif

Most answers to coding questions and examples can be found here:

https://www.prorealcode.com/prorealtime-documentation/