smdMTS function, metaSEM

Dear Mike and colleagues,

I would like to use the metaSEM package to calculate a multivariate meta-analysis (fixed effects) with multiple treatment groups.
My two studies include three conditions and one dependent variable.
In a first step, I used the smdMTS function to calculate the covariance and the effects for my four comparisons in each study. Subsequently, I would like to use the meta function. However, I am not sure if I used the smdMTS function right and how I have to structure my data for the meta function. I looked up examples, but I couldn’t find any information on how to proceed when there are three or more contrasts from interest.

I have copied my specific questions in the attached R script. That might make it easier.

Thank you very much for your help!
Kind regards,
Marie