You are most welcome. If spouse is included in your application (I assume you got married after applying or something, otherwise submitting upfront medicals with Express entry application would have been mandatory), then you could reuse the same medicals.
You could have used the same my cic account if you were also applying for yourself, which is not the case. So you have to create a separate account for your spouse.
The questionnaire is "come to Canada wizard" where you try answering as a worker with dependent SOWP. The docs would be like proof of relationship (for recent marriage just marriage certificate IS NOT enough), your work permit (existing as well as proof of having applied for extension), proof of your job being skilled and preferably something recent showing you are currently working (pay stub, t4 etc.) would suffice.
However, if you were applying for your own BOWP too from your my cic, you could have used the same account and submit application for your spouse.