Generally, the tax in ShopFactory is applied to the whole product, not on just a part of it. However, you can set it up by adjusting the tax rate using the ratio of the part of the product.

For example:  

What it should be:
For the tax 19% = 45 / 119 * 19 = 7.18
For the tax 6% = 60 / 106 * 6 = 3.40

ShopFactory set up:

Tax rate of Tax 19% should be set to (19 * 45/105)= 8.14
Tax rate of Tax 6% should be set to (6 * 60/105) =3.43
For the tax 19% = 105 / 119 * 8.14 = 7.18
For the tax 6% = 105 / 106 * 3.43 = 3.40

Therefore, you should create 2 new taxes with tax rates of 8.14% and 3.43%, and assign them to the product.