Hello Venkat,
what should be the basis for the percentage calculation?
If it is some flow (type) directly linked to one securities deal, you could check the 'derived flows' functionality.
If it is the (tpm40) position at calculation date, you could rather set up a condition in FWZZ with calculation type TB (Charge similar to interest).
But for a 'manually' created other flow, there is no possibility to enter a percentage: it is not as clear as in money market to which amount/flow/position this percentage refers to.
Hope this helps,
best regards,
Marie