There is not a way directly to export all of the models you need for a specific map, however there is a way to get a list of all the existing textures and
models on the map so you can find them easily in the GRF to then manually export. To do this Open the Map you are working on and then go to;
File => Export Map Files
This will create a text document for you in which it will list the models and textures used and should look a bit like this;
model³»ºÎ¼ÒǰÇÁ·Ð¾Æ·¹³ª1-ȶºÒ.rsm
texture³»ºÎ¼Òǰarena1-3.bmp
modelÇÁ·ÐÅ×¶ó¸ùÅ©°Ç¹°08.rsm
textureÇÁ·ÐÅ×¶óprt_f_b_03.bmp
Etc.....
From here navigate to the proper files and build a patch for them so you need not use the arcturus.grf