We know that both .phd and .pob files are produced by Punch! family of design software, so if any program is capable of phd to pob conversion it would be this one. If this conversion is actually useful or even possible could not be reliably verified, if you know any information, please write it in the discussion below.
Convert Punch! software CAD plan to Punch! CAD 3D graphics file.
We found one software available in the database for this conversion.
Microsoft Windows software - convert phd to pob on Windows
A suite of architecture modeling tools
Convert from phd file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.