You can increase the number of exemptions on a W-4 to have less taxes withheld from your wages. The number of exemptions claimed on a W-4 is not relevant to the number of dependents claimed on a tax return.
See this IRS website for a withholding calculator - https://www.irs.gov/Individuals/IRS-Withholding-Calculator
Or see this TurboTax website for a withholding calculator - https://turbotax.intuit.com/tax-tools/calculators/w4/
