Adrian - from https://openvpms.org/documentation/csh/2.0/reference/jxpath or https://openvpms.org/documentation/csh/1.9/reference/jxpath for the email address you need party:getEmailAddress(openvpms:get(., "xxxx"))

I cannot say what XXXX is (ie how to reference the clinician) without knowing more details of what the letter is working with. It is probably clinician.entity

Qualifications: if you have a look at the security.user archetype you will see that the qualifications are have the path /details/qualifications - and from https://openvpms.org/documentation/csh/2.0/reference/reportFields or https://openvpms.org/documentation/csh/1.9/reference/reportFields you will see there is a table as follows:

so we can access the qualifications via openvpms:get(., "xxxx.qualifications")

Finally - remember that you should be able to grab the clinician's title, name and qualifications using something like [user:format(openvpms:get(., 'clinician.entity'), 'long')]

Note that I grabbed the above from the sample patient document in <OPENVPMS-HOME>\reports\Sample\A4\Sample Patient Document.odt - this also contains examples of how to hide fields - but remember that this is best used to switch text - ie doing his/her based on sex.

If you are trying to do sexy things (and it sounds like you are) hiding & showing large chunks of text, it would be better to work with a jrxml document rather than an odt one. With jrxml you have much more power with the 'Print when' facility. You might want to look at <OPENVPMS-HOME>\reports\Sample\A4\Sample Rabies Certificate.jrxml

Regards, Tim G