The garage can be included as part of the same community, but when the budget for the year is worked out by the administrator (and approved by your elected president) the anticipated costs for the upkeep of the community should be split into different categories, i.e. apartments/garages/commercial locales. A separate quota can then be calculated for garage spaces. In order to keep the budgets and quotas entirely separate, it may be advantageous to have separate bank accounts for each category.
However, it can get complicated working out what proportion of certain costs should be allocated to which area. For example, the lifts likely serve both apartments and garage, and it's impossible to say what proportion of the maintanance of the lift should be for the account of the garages as opposed to the apartments. In our community, the automated garage doors and the lights in the garage run off the same meter as the rest of the community installations such as the lights in the corridors, so again, how do you split it? It would certainly be much simpler if all the garage spaces belonged to (and were inseperable from) an apartment, but that's rarely the case. Similarly with basement store rooms (trasteros).
Gina, since you (presumably, from your post) do not own a garage space, it's important for you to make sure that the community is set up with separate budgets for apartments and garages, so that you are not paying for the upkeep of communal facilities which you do not participate in. When you receive the annual budget you will be able to see if this has been done. If you are unable to attend the first meeting yourself, try to get someone to represent you by proxy, and ask them to check if this is in fact the case.
Hope this makes sense?