Okay, i think for some days i will be really determined to start and complete this project, after that probably i will abandon this, but until that I will have finally something interesting to do big grin. Here i shall write down how i planned to do this. If anything would be incorrect or there would be an easier solution please correct me:

1. I would like to create some buttons on the strategic map interface to navigate between the maps and with this change the map picture. (I think that's the easiest part.)

2. I have to learn how the saving functions work and then add a new variable for every possible object (merc, npc, item, etc.) which will determine which map it belongs to. (I hope these are in classes or structs.) Then i have to modify the loading functions to understand the changes.

3. Every place where an object is created must be modified to add the new variable which will determine what map it belongs to.

Then of course there is no solution yet for the quests, and enemy movement (how the enemy would move and attack if we leave the current map, it shouldn't be discarded but i don't see other solution except somehow handling all the maps parallel). And all these changes should be made with ini variables for the different maps to be able to easily create a new one, and should be handled in different folders.