The meaning of that sentence is "if you have more money". it's mean that if you have more money than you have now. Btw i just wanna correct your word, it's "maksudnya apa?" not "maksud apa?" you miss the affix "-nya". good luck Julian :)

Kalau Anda punya sedikit lebih banyak uang. This is not a good sentence and it is not complete. The example of correct sentence should be "Kalau Anda punya uang lebih, Anda harus menabung". In Mandarin is "如果你有多余的钱,你应该把钱省下来". I hope my explannational is helpful for you.

If you have more money.. It's simply a sentence that saying you have more money than someone.