quick ? on magical weapon enhancement

[Veven1290]

Would i need to pay for my +1 holy burst war hammer all at once or can i slap on each enhancement as i have gold to afford it (pay 2,000 for +1, then later pay 16,000 to put holy on it, and then finally pay another 14,000 to bump it up to holy burst)?

 

[Theo R Cwithin]

Building up an item one ability at a time is supported by the rules.
Of course, it's the DM's call, but I suspect most campaigns are run like that .