I have multiple attributes in a vector file which is .shp that I want to convert to a raster, this is because I want to make it the same resolution of another raster file. I will then convert that raster file back to vector once I have burnt all those values I need from the vector-raster conversion. The issue is I need multiple fields and not just one.
Create a new field (a virtual or a real field) that combines the fields you want to use for burn-in values the way you want using field calculator. Ten use this new field as input.
Like e.g. you have two fields
v2, calculate a new field
v as the sum of
v1+v2. Then use this new field for rasterization.