Hi,
For any type of Allowances copy from the Model WT - M200, for deductions wt copy from - MDD0.
you can copy from any Model WT or from your custom wt also but according to the requirement you have to change the new wage type PC,CC,EC. that's why it is preferred to copy form the specific model wage types.
for your query IT 0014 is the best option.
for Transport give dates like 01.04.2014 to 31.03.2015 (every month pay)
for uniform/benefit/personnel allowances any specific date is there ? if so you can go with IT 0015 otherwise you can go with IT 0014 also dates should be one month only. like this you have to maintain the master data two times in a year.
For Deductions also same.
All the Allowances are Taxable.
you can upload at a time through fast entry PA70.
try in testing server and get approved by the client and then transport to production server.
Best Regards.