Projects and Tax Accounting

This is a bit of an open an ended question & possibly the first time I have posted this space. Please bear with me......

I have bit of experience in using Tax Manager to push Purchasing and Sales transactions to the Sales tax treatment that we require

Have done this via Tax Rules etc

The project in question is broadly a capital project. The expenditure types are broadly:

Valuation Fees

Contract Works

External Legal Fees

Landscape Architects Fees

etc, etc

What we would like is to try to push certain Purchasing type transactions, associated with this Project toward specific UK  sales Tax treatment. Whilst ensuring that non Project related transactions are not (necessarily) treated in the same way