Replacing parts in a schematic

I set my parts up first so that I will come out with a manufacturing BOM at the end of my design so swapping parameters will presumably just alter the part, i could of course copy the same properties from another part ? or if I say delete a resistor and replace it giving it the same reference number like "R10" will that still link to the placed footprint on the PCB ?

If you have the full manufacturing / BOM data attached to the library part then you would need to delete the part and add the correct one from your library otherwise the BOM would be wrong, just changing the Value parameter of the resistor from say 1K to 22K would not work as the other part information would not be updated. Instead you would presumably have a 22K resistor in your library to pull in. If you have set your library to have a components for every possible resistor value you are using then you would have to already have set up exactly one footprint on the part that matches the part you will be purchasing. This way the schematic user doesn't need to be concerned because the correct footprint would be part of the symbol. If allowing a choice of footprint from the library (e.g. a 22K resistor in 0805 and 1206 variants) then you can have two footprints attached but your BOM generation / purchasing department would need to be able to use the footprint column to differentiate between otherwise identical parts. The same would apply if you chose to have one generic resistor, the purchasing department would have to use the Value and Footprint column to determine the actual part to buy.

With regards to PCB linking, if you delete a resistor, add in a replacement one and give it the same reference designator then it will link to the PCB part by virtual of identical ref des. You would need to use the Update PCB function to pass across the new data because it is possible the footprint will have changed.

If you have the full manufacturing / BOM data attached to the library part then you would need to delete the part and add the correct one from your library otherwise the BOM would be wrong, just changing the Value parameter of the resistor from say 1K to 22K would not work as the other part information would not be updated. Instead you would presumably have a 22K resistor in your library to pull in. If you have set your library to have a components for every possible resistor value you are using then you would have to already have set up exactly one footprint on the part that matches the part you will be purchasing. This way the schematic user doesn't need to be concerned because the correct footprint would be part of the symbol. If allowing a choice of footprint from the library (e.g. a 22K resistor in 0805 and 1206 variants) then you can have two footprints attached but your BOM generation / purchasing department would need to be able to use the footprint column to differentiate between otherwise identical parts. The same would apply if you chose to have one generic resistor, the purchasing department would have to use the Value and Footprint column to determine the actual part to buy.

With regards to PCB linking, if you delete a resistor, add in a replacement one and give it the same reference designator then it will link to the PCB part by virtual of identical ref des. You would need to use the Update PCB function to pass across the new data because it is possible the footprint will have changed.