Is it possible to add the result of multiple macros together?
What I am trying to do is: a (Player select dropdown +1) (times a skill roll - 8 ) (Plusitem level divided by two). I couldn't figure out how to do it in one macro but each works on its own.
I'm unclear from your example exactly what you are trying to do.
You can chain multiple macros together, but they need to be written carefully to allow it, and once done, they often dont work on their own any more. So you generally have the standalone macros you need, and then write a separate macro that contains them both. It's duplication, but necessary.
Another thing: you cannot save the results of one roll as a variable to reuse later. I'm not sure if this is relevant to what you're trying, but thought I'd mention it.
Assuming that the dropdown selection is one element, the roll happens at the time the macro is run, and the item level is a given attribute on a character, it should work. It's impossible to answer more succinctly without more details, such as which sheet you are using. This is a barebones example.
[[?{Select option|1}*1d20-8+@{Bob the Barbarian|itemlevel}/2]]It would allow the user to select "1" from a drop down, multiply it by (1d20-8), and add the value for the attribute "itemlevel" on a character named "Bob the Barbarian".
Here is what I have for the individual macros.
[[ ?{Item Tier?|1|2|3} + 1]] * [[@{Player|GeneralEducation}d6-8]] + [[ ?{item Level?|}/2]]
Try
[[(?{Item Tier?|1|2|3}+1)*(@{Player|GeneralEducation})d6-8+(?{item Level?|}/2)]]You should use parentheses in many of the places you have brackets. I'm not certain if this exactly models the formula you wish--I'm not familiar with the system. But it should get you on the right track. Hover over the result in chat and see if the order of operations is correct.