Partial withdrawals from a deposit aren't available in the same way for all products.
Key points
Some deposits require full withdrawal, while others allow for different handling or recalculation of interest.
Before committing, ask explicitly about partial redemption and what happens to your interest if you need part of the amount.
If you anticipate withdrawing in installments, a savings account might be more convenient than a fixed deposit.
The figures, fees and limits in this answer vary by bank and change over time — confirm them with your bank or the official source before acting.