Today in my company, we work with Qlikview to extract information and make reports for all internal areas. In the future, we will change the tool and will use Splunk. However, I don't know if it is possible as I saw that Splunk is not a tool for BI, but I'm not sure... can you help me please?
Whatever you can do with Qlikview, you will be able to do something similar (if not exactly the same) with Splunk. The main difference is that Splunk will allow (forces) you to work directly with the raw data. If you are used to Qlikview, this will take some adjustment because you have probably been using "pre-digested" data and then performing pivots and visualizations based on that. In theory, you could continue to do the same thing by taking your pre-digested files and saving them in Splunk as-is as lookup tables (assuming you mostly work with *.csv files) and then using the inputcsv command. However that would mean missing out on all the other amazing (drilldown) things that you can do when you have the raw data right there for the clicking. In preparation, I suggest you read up on pivot which is probably where you will spend most of your time:
Also, I cannot recommend highly enough that new users get a free Splunk Cloud sandbox and go through the interactive demo (~ 1 hour) which ends in pivot. This will give you enough of a bearing to work through everything else: