Trying to tune the Wall Street Gallery and table from CL

Hi all! I am very new to modding and tuning of objects. But I recently discovered S4S and I was hoping someone could help! I'm trying to mod the Wall Street Gallery and Street Market table. Right now, they can only be used on your home lot or during a spice market festival. I want to make the Wall and Table useable whenever the sims wants to make extra cash. Another major thing, you can only place paintings on the Wall Street Gallery. You cant place paintings, or wall decorations from buy more NOR can you place photographs taken in game with a camera. I am DESEPERATELY trying to override these features. I was told it would be easy... I just need a little help. Any ideas what I should do? DM on twitter if needed DeeSims or @dianeheehee