yes I activated PDOS option before calculation still it is not coming in the analysis tab after calculations are over

Sir, First you should prepare in individual atomic contributions with atomic number in text file. 

PDOS is the individual fragments charge distribution. ex..(o-h, c-h2, c-h, ...) Put the results in our gausssum software. U got the pdos spectrum. 

Have you copied all the files back from the server? You'll need the pdos_weights file, in particular. You also have to make sure that the correct model is selected within Materials Studio.

Resulting structure (/xsd file) must be active for the PDOS option in DOS menu to be selectable.

First thing is while doing DOS calculation there is a option for PDOS click it before calculation. Secondly If you have already given PDOS calculation and unable to access it, before doing PDOS analysis you should click on the .xsd document and then go to dos analysis. If the atomistic document is not activated in the working window it will not activate PDOS option. Hope this will solve your problem.

Resulting structure (/xsd file) must be active for the PDOS option in DOS menu to be selectable

After calculation, select/click the generated reciprocal lattice structure and then go to analysis menu for active PDOS option...........

I also faced the same problem and finally found the reason why PDOS was disabled. At first, you do not change the file name (Usually, the file name is '3D Atomistic CASTEP Properties' after completing the program successfully and keep this name) then go to xsd file then go to analyze option and select Density of State. Hopefully, PDOS option will be active. Bhrigumoni Deka

You must check the PDOS box when selecting DOS calculation. After that, if you successfully completed DOS calculation but unable to find PDOS then before doing PDOS analysis you should click on the .xsd document and select the Density of states.