DesignBuilder calculates behind the scenes the length of each thermal bridge which is then multiplied by the corresponding Psi category. It will provide an equivalent length that can be found in the IDF object. See the image below.
It is on our development list to provide a thermal bridging report in future versions.
A possible way to check the length of each thermal bridge is by setting the Psi values to zero and leaving the category you want to be set to 1.
This will provide the real length but it is a quite time-consuming process since you need to run a simulation for each category and check the IDF file. See the example below:
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