In FireStart it is possible to link a process to another in order to execute them one after the other. Therefore, it should also be possible to pass values between those two processes.
The first thing you need to do is to configure the Start event of the process you want to link. So you have the initial process and a process you would like to link. The Start event of the process you want to link must be configured as an Internal event because you will not find it in the selection dialog otherwise. When configuring the Internal event, you also have to select the variables to pass the data to from the other process.
The next thing to do is to link the process and for that, you need a Link element. To link a process double-click the element and select Select linked models. A new dialog opens where you first have to choose the process you want to link. After that, you have to click next in order to get to the settings where you can map the data you want to pass on to the linked process. The start parameters of the linked process (which you previously configured) are displayed on the right side. On the left side are all available variables of the current process displayed. Now you just have to map the variables you want to pass on with the start parameters.