How do i control what gets mass-melted in my Blast Furnace? Because they seem to melt things whether they are designated for melting or not. Same thing for my waatorium.
Queue up the melt object job. Then hit alt+a to bring up a menu. In there choose in inorganics -metal- then the metal type you want. This also works great for anything. For example say you have 100 copper Spears and one adamantine one. You want to sacrifice copper ones at the altar of armok. Use alt+a to only select copper spears to sacrifice.
I really need a way to know what can I do with a particular item 
For example I have dozens and dozens of single bone, skulls.. etc I cant use them to make bone things at the craftsdwarf workshop.
And theres a way to preserve corpses from rotting? And scalps?
Thanks
If bones are you problem try the bonecarver workshop. You can also make them into ammo. Skulls are used for totems I believe. You maybe also be able to sacrifice them in the religious buildings for increased chance of rewards.
Some people like to run an experimental fort where there gift themselves a ton of points at embark and bring enough food and booze with them to totally wall in then build every type of new workshop to get to know them. Most of the new masterwork workshops are relatively self explanatory in their names, a few not so much. Is there anything besides bone you're having trouble with?
A couple of questions.
In the tailor's workshop theres and option to make sets of clothing for fur, silk, rare silk, and wool, but not for cotton fiber?¿ EDITED: Now theres the option, aparrently I had insufficient cotton at the moment, but I though you saw reactions red instead of no reaction at all?
Whats ground meat(produced from meat in the kitchen) used for? And is there any way to access the ''used for'' menu for items, like when you select a stone and it tells you all of the uses for that stone, and the place to do them.
Thanks
Red reactions in many workshops cycle to the bottom so you don't have to scroll through a hundred red reactions to find the one white reaction you are looking for. Comes in very handy in workshops that produce many types of things. You grind meat and then turn the ground meat into sausages. The extra steps to make sausage make meat edible without having to cook it into a meal type. This is the same for the boil egg reaction. So instead of tons of inedible stuff filling up your stockpiles waiting for a making meal order, you can just turn them edible.
I have no idea about a used for menu. However theres are many thousands of extra reactions in masterwork so it would probably be extremely hard to find. Just mess around with the various workshops. A good tip is to create blocks and then use the stonecutters workshops to make almost anything from blocks. I'd suggest really read the manual, not just skim through it. There are many tips for each industry that you'll be kicking yourself for skipping if you do. My biggest mistake was skipping the new workshops for stone and wood for so long. Every masterwork building is designed to cut out some of the tedious parts of vanilla. Why make each chair/table when you can make whole sets in the furniture maker? Or why queue up hundreds of shirts when you can make whole outfits in the clothemakers? There are also lots of workarounds for vanilla shortcomings. You can make stone beds for example while in vanilla you pretty much have to embark with wood or on a forest if you want any chance at happy sleeping dwarves.
