No, you can buy TA based trade whenever you get a good TA buy signal on an A, B or C rated stock display in your Watchlist.


Like Courtney's say, you can buy all the techniques all the time. 


Since you can have many signals on the same stock, you take the technique that is the nearest to getting filled. This is why you have a column titled "% of high" in the Watchlist that is telling you how much % is needed by the stock to reach your buy price and also the column "% to be filled" in the Portfolio "In Order" tab.


If you are looking to pyramid, then you can use the principle of diversification through time, which mean that you will, when you are pyramiding, alternate CB and TA trade.