The Called methods tab shows the methods that were called by the highlighted method. In other words, they show where the highlighted method is doing its work.
If only the highlighted method is shown, no methods called by that method were sampled. Either the methods called ran quickly, or they were inlined. If the method has children in the tree, the percentages typically do not add up to 100%. The percentages for child methods never add up to more than 100%. The difference in percentages indicates the time spent in the body of the highlighted method.
The Called methods tab is less useful for performance tuning than the Invocation paths tab. Time spent processing children is not counted as time spent processing the parent. A lightweight method calling some inefficient children is not placed high in the method profile table. Any inefficient child methods typically show up in the method profile table anyway.