Hello Prachi,
PSD is supported by PubCoder as an image format: what PubCoder doesn't do is giving access to individual layers inside PSD file.
By the way, the better way to use the different layers as different objects in PubCoder is exporting layers to files from Photoshop (File > Export > Layers To Files...) and then importing the individual PNG images in PubCoder (you can drag them all to the stage or assets panel in the project window).

Regards,
Angelo