Yes - the scenario you have outlined can be lodged in PEXA. The normal setup would apply (this is where it can get a little confusing), in your example party B (the beneficiary) would be created as an "Incoming Proprietor" party and would have the beneficiary capacity, the share that belongs to party D would be affected in the document. Upon registration of the document, the two half shares should be amalgamated and B would end up as the sole proprietor of the title.
Below is a link to a guide on completing transmissions direct to beneficiary:
If you have any further questions, or would like any clarification regarding the above please reply to this post, you can also contact our friendly member support team on 1300 084 515 they will be more than happy to assist you with the setup of your workspace where they can!