Adding One Time Expense

create a LOE activity 

make the predcessors is a SS relationship with the 1st activity 

make the successor a ff relationship with the last activity in the schedule 

create a resource call it lumpsum

assign the resource to loe activity

add the cost for the project to the resource

then assign a curve to the resource 

Hi Usman,

By the sound of it, you just want one activity to equal your total cost on the project. If you don't need to utilize the histograms, then just create a user defined field and call it "Total Expense Cost", and input the value to the activity that you desire.

Regards,

Patrick